الهيئة السعودية للمواصفات والمقاييس والجودة  
Saudi Standards, Metrology and Quality Org(SASO)  
 
 
 
 
SASO /FDS  2910 /0000  
TRAILER - GENERAL REQUIREMENTS  
 
 
ICS: 91.140.60  
This document is a draft Saudi Standard circulated for comments. It is, therefore, 
subject to alteration and modification and may not be referred to as a Saudi 
Standard until approved by SASO . 
 
  
  
 SASO STANDARD                                                                                SASO 2910/2018  
       
  
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 TRAILER - GENERAL REQUIREMENTS  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Date of SASO Board of Directors' Approval:  
  
Date of Publication in the Official Gazette:   
  
  
 
 
 
  
  
   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  Contents  
  
1. SCOPE AND FIELD OF APPLICATION  ................................ ..........................  3 
2. COMPLEMENTARY REFERENCES  ................................ ...............................  3 
3. DEFINITIONS  ................................ ................................ ................................ ..... 5 
4. DIMENSIONS  ................................ ................................ ................................ ...... 9 
5. MINIMUM ROAD CLEARANCE  ................................ ................................ .... 10 
6. GROSS VE HICLE AND AXLE WEIGHT  ................................ .......................  10 
7. STABILITY  ................................ ................................ ................................ ........  11 
8. ELECTRIC SYSTEM  ................................ ................................ ........................  12 
9. BRAKING SYSTEM  ................................ ................................ ..........................  13 
10. SUSPENSION SYSTEM  ................................ ................................ ..................  14 
11. FRAME AND BODY  ................................ ................................ .......................  14 
12. COUPLING DEVICES AND TOWING METHODS ................................ ..... 16 
13. WHEELS (TYRES AND RIMS) ................................ ................................ ...... 17 
14. LIGHTING EQUIPMENT  ................................ ................................ ..............  18 
15. INCOMPLETE VEHICL ES ................................ ................................ ............  20 
16. VEHICLE IDENTIFICATION NUMBER (VIN)  ................................ ...........  21 
17. COMPLIANCE PLATE  ................................ ................................ ..................  27 
         Reference  ................................ ................................ ................................ ......... 31 
 
 
 
 
   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  TRAILER - GENERAL REQUIREMENTS  
 
1. SCOPE AND FIELD OF APPLICATION                 
1.1 This standard is concerned with general requirements for trailers and semi -trailers ensuring 
high levels of safety, Environmental protection, energy efficiency and antitheft performance for 
detailed requirements refer to SAUDI STANDARDS METROLOGY QUALITY  
ORGANIZATION (SASO)  Technical Regulations on the subject concerned.  
 
1.2 SASO technical regulation related to vehicles will be formulated based on UNITED  
NATIONS ECONOMIC COMMISSION FOR EUROPE UN/ECE  regulation in the case of 
vehicles manufactured in com pliance with FEDERAL MOTOR VEHICLE SAFETY  
STANDARDS FMVSS  regulations, will be accepted as an alternative.  
    
1.3 The provisions of this standard apply to all trailers and semi -trailers industry designed for 
road  circulation.  
 
1.4  This standard does n ot cover the armed services trailers.  
 
2.  COMPLEMENTARY REFERENCES  
2.1 The following codes, standards and regulations are used as reference documents in the 
compilation of this standard.  
  
   STANDARD  STANDARD TITLE  
 2.1.1  SASO GSO 42   Motor Vehicles - General Requirements  
 2.1.2  SASO GSO ECE 48   Uniform provisions concerning the approval of vehicles with  regard to 
the installation of lighting and light -signaling devices  
  Uniform provisions concerning the approval of tires with regard to  
 2.1.3  SASO GSO ECE 117  rolling sound emissions and/or to adhesion on wet surfaces and/or to 
rolling resistance  
 2.1.4  SASO ISO 303   Road vehicles -- Installation of lighting and light signaling  devices for 
motor vehicles and their trailers  
 2.1.5  SASO ISO 337  Road vehicles -- 50 semi -trailer fifth wheel coupling pin -- Basic and  
mounting/interchangeability dimensions  
 2.1.6  SASO 400   Motor Vehicles Conformity Certificates  
 2.1.7  SASO 469   Motor Vehicles – Dimensions and Weights  
 2.1.8  SASO 572  Road Vehicles - Retro -Reflective Number Plates and Its Methods of  
Test 
 2.1.9  SASO ISO 612  Road vehicles -- Dimensions of motor vehicles and towed vehicles --  
Terms and definitions  
 2.1.10   SASO 703  Motor Vehicle - Conformity Certificates for Vehicle Manufactured in  
Multi -Stages  
 2.1.11   SASO 1071   Road Vehicles - Types — Terms and Definitions   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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   2.1.12   SASO ISO 1103   Road vehicles -- Coupling balls for caravans and light trailers - 
Dimensions  
 
 2.1.13   SASO 1134  
  Multi -Purpose Vehicles, Trucks, Buses and Trailers Tires Part 1:  
Nomenclature, Designation, Marking, Dimensions, Load Capacities  
and Inflation Pressures  
 2.1.14   SASO 1135   Multi -Purpose Vehicles, Trucks, Buses and Trailers Tires  - PART 2: 
Methods of Test  
 2.1.15   SASO 1136   Multi -Purpose Vehicles, Trucks, Buses and Trailers Tires  Part 3: General 
Requirements  
  Road vehicles -- Connectors for the electrical connection of towing and  
 2.1.16   SASO ISO 1185  towed vehicles -- 7-pole connector type 24 N (normal) for vehicles  
with 24 V nominal supply voltage  
 2.1.17   SASO 1275   Retreaded pneumatic tires for trucks and their trailers  
 2.1.18   SASO 1285  Transportation of Dangerous Substances by Road - Part 1: General  
Safety Requirements  
 2.1.19   SASO 1286   Transportation of Dangerous Substances by Road  - Part 2: 
Transportation of Radioactive Materials  
 2.1.20   SASO 1287   Transportation of Dangerous Substances by Road  - Part 3: 
Transportation of Petroleum Liquid  
 2.1.21   SASO 1288   Transportation of Dangerous Substances by Road  Part 4: 
Transportation of Explosive Materials  
  Road vehicles -- Connectors for the electrical connection of towing and  
 2.1.22   SASO -ISO-1724 towed vehicles -- 7-pole connector type 12 N (normal) for vehicles  
with 12 V nominal supply voltage  
  Road vehicles -- Mechanical coupling between tractors and semitrailers  
 2.1.23   SASO ISO 1726 -1 -- Part 1: Interchangeability between tractors and semi -trailers for  
general cargo  
  Road vehicles -- Mechanical couplings between tractors and  
 2.1.24   SASO ISO 1726 -2 semitrailers -- Part 2: Interchangeability between low -coupling tractors  
and high -volume semi -trailers  
  Road vehicles -- Mechanical couplings between tractors and  
 2.1.25   SASO ISO 1726 -3 semitrailers -- Part 3: Requirements for semi -trailer contact area to fifth  
wheel  
 2.1.26   SASO 1771  Motor Vehicles Tires -- Temporary Use Spare Wheels/Tires and Their  
Methods of Test  
 2.1.27   SASO GSO 2113  Motor vehicles -lateral protection of truck and trailer and its methods of  
test 
 2.1.28   SASO GSO 2114  Motor vehicles -rear under run protective devices for truck and trailer  
and its methods of test  
 2.1.29   SASO 2249   Motor Vehicle - Vehicle Identification Number (VIN)  Requirements  
 2.1.30   SASO 2250   Motor vehicles - world manufacturer identifier code  
 2.1.31   SASO 2251   Motor vehicle - VIN-location and attachment  
 2.1.32   SASO 2288   Road Vehicles - Bottom Loading Tank Truck & trailer   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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   2.1.33   SASO ISO 3536   Road vehicles -- Safety glazing materials -- Vocabulary  
 2.1.34   SASO ISO 3584   Road vehicles -- Drawbar couplings -- Interchangeability  
  Road vehicles -- Connectors for the electrical connection of towing and  
 2.1.35   SASO ISO 3731  towed vehicles -- 7-pole connector type 24 S (supplementary) for  
vehicles with 24 V nominal supply voltage  
 2.1.36   SASO ISO 3833   Road vehicles -- Types -- Terms and definitions  
 2.1.37   SASO ISO 3842   Road vehicles -- Fifth wheels -- Interchangeability  
 2.1.38  SASO GSO ISO  3894   Road vehicles: Wheels/rims for commercial vehicles - Test methods  
 2.1.39   SASO ISO 4086  Road vehicles -- 90 semi -trailer fifth wheel kingpin -- Interchangeability  
 2.1.40   SASO ISO 4091  Road vehicles -- Connectors for the electrical connection of towing and  
towed vehicles -- Definitions, tests and requirements  
 2.1.41   SASO ISO 4107   Comm ercial vehicles -- Wheel -hub attachment dimensions  
  Road vehicles -- Connectors for the electrical connection of towing and  
 2.1.42   SASO ISO 7638 -1 towed vehicles -- Part 1: Connectors for braking systems and running  
gear of vehicles with 24 V nominal supply voltage  
  Road vehicles -- Connectors for the electrical connection of towing and  
 2.1.43   SASO ISO 7638 -2 towed vehicles -- Part 2: Connectors for braking systems and running  
gear of vehicles with 12 V nominal supply voltage  
 2.1.44   SASO -ISO-8716  Road vehicles -- Fifth wheel kingpins -- Strength test  
 2.1.45   SASO ISO 8855   Road vehicles -- Vehicle dynamics and road -holding ability - 
Vocabulary  
 2.1.46   SASO ISO 10392   Road vehicles -- Determination of center of gravity  
   Road vehicles -- Connectors for the electrical connection of  
 2.1.47   SASO ISO 11446   towing and towed vehicles -- 13-pole connectors for vehicles  with 12 V 
nominal supply voltage  
  Road vehicles -- Connectors for the electrical connection of towing and  
 2.1.48   SASO -ISO-12098  towed vehicles -- 15-pole connector for vehicles with 24 V nominal  
supply voltage  
 2.1.49  SASO GSO ISO  
13207 -1 Road vehicles — LED lamp characteristics for  bulb compatible failure  
detection — Part 1: LED lamps used as direction indicators  
 2.1.50   SASO ISO 15082   Road vehicles -- Tests for rigid plastic safety glazing materials  
 2.1.51   SASO ISO 20653   Road vehicles -- Degrees of protection (IP code) -- Protection of  
electrical equipment against foreign objects, water and access  
 2.1.52  SASO GSO ISO/TS  
20825  Road vehicles — Drawbar couplings, drawbar eyes, fifth wheel 
kingpins, hook couplings and toroidal eyes — Wear limits for in -use  
mechanical couplings  
  
 3.  DEFINITIONS  
For the purposes of this regulation, the following definitions shall apply in addition to the 
definitions set out in list of standards paragraph (2).  
   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  3.1 Automotive Trailer s (O Category):  
A non -self-propelled vehicle having at least two wheels which on account of its design and 
technical features is used to transport goods and is intended to be towed by a motor vehicle;  
Semi -trailer  is included in this category.  
 
3.1.1 Category O 1: 
 Trailers with a maximum mass not exceeding 0.75 tons.  
 
3.1.2 Category O 2: 
 Trailers with a maximum mass exceeding 0.75 tons but not exceeding 3.5 tons.  
 
3.1.3 Category O 3: 
 Trailers with a maximum mass exceeding 3.5 tons but not exceeding 10 tons.  
 
3.1.4 Category O 4: 
 Trailers with a maximum mass exceeding 10 tons.  
 
3.2 Tractor:  
A truck (provided with fifth wheel) designed primarily for drawing a semitrailer and not so   
constructed as to carry a load other than a part of the weight of the semitrailer.     
 
3.3 Truck:  
 A motor vehicle intended for carrying goods, or towing a trailer.  
 
3.4 Vehicle:  
 Any motor vehicle or its trailer.  
 
3.5 Semi -trailer:  
A trailer, which is intended to be connected to a motor vehicle and which is so constructed t hat  
a portion of it is superimposed on and apart of whose weight is borne by the haulage tractor.  
 
3.6 Drawbar trailer:  
  A towed vehicle with at least two axles, of which at least one is a steered axle, and:  
— Equipped with a towing device which can move  vertically (in relation to the trailer),  
— Which transmits no significant static vertical load to the towing 2 vehicle (less than 100  
daN).  
When a semi -trailer is coupled to a dolly axle it is considered to be a drawbar trailer.  
 
3.7 Maximum (gross) vehic les weight (GVW):  
Weight of the vehicle loaded with the maximum load specified by the manufacturer.  
 
 
 
  SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  3.8 Maximum (gross) axle weight (GAW):  
The maximum load carrying capacity, specified by the manufacturer, of a single axle measured 
at the tyre -ground i nterfaces.  
 
3.9 Overhang:  
The horizontal distance (a bus, truck, trailer or semi -trailer) between the centers of the rear most 
axle and the rear most part of the body, or between the center of the front most axle and the 
front most part of the body.  
 
3.10 Drawbar :   
Strut or column like device temporarily attached between the rear of a towing vehicle and the 
front of the vehicle being towed. Its purpose is to maintain the interval or distance between the 
two.  
 
3.11 Fifth Wheel Coupling:   
A device used to  connect a tractor to a semi -trailer and to permit articulation between the units. 
It is generally composed of a lower half, mounted on the tractor, consisting of a trunnion, plate 
and latching mechanism, for connection with a king pin mounted on the semi -trailer.  
  
3.12 King pin:   
The trailer part of the mechanical coupling of a transport trailer normally attached to fifth wheel 
of the tractor.   
 
3.13 Group of axles:   
Axles being part of a bogie. A two axle  group is called a tandem and a tri -axle group a tri -axle 
bogie. By convention, a solo axle is considered as a group of one axle.  
 
 3.14 Axle end:  
 Group of tyres on one of the axle ends bearing half the load lying on the axle end.  
 
 
 3.15 Air suspension :  
 A suspension system on which at least 75% of the spring effect is caused by the air spring.  
 
3.16 Spray -suppression system:  
A system intended to reduce the pulverization of water thrown upwards by the tyres of a vehicle 
in motion. The spray -suppressio n system is variously made up of a mudguard, rain flaps and 
valances equipped with a spray -suppression device.  
 
3.17 Vehicle identification number VIN:  
Structured combination of characters assigned to a vehicle by the manufacturer for 
identification purposes.   
 
3.18 World manufacturer identifier WMI:  
First section of the vehicle identification number, which designates the manufacturer of the 
vehicle and is assigned to a vehicle manufacturer in order to allow identification of that 
manufacturer.  
  SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  NOTE: When used in conjunction with the remaining sections of the VIN, the WMI ensures the           uniqueness 
of the VIN for all vehicles manufactured in the world for a period of 30 years.  
 
3.19 Vehicle descriptor section VDS:  
Second section of the veh icle identification number, which provides information describing the 
general attributes of the vehicle.  
 
3.20 Vehicle indicator section VIS:  
Third and final section of the vehicle identification number, which constitutes a combination of 
characters assi gned by the manufacturer to distinguish one vehicle from another.   
 
3.21 Incomplete trailer:  
Any trailer which must undergo at least one further stage of completion in order to meet the  
relevant technical requirements of this Directive.  
 
3.22 Complete trailer : 
Any trailer which need not be completed in order to meet the relevant technical requirements  
of this Directive.  
 
3.23 System:  
An assembly of devices combined to perform one or more specific functions in a trailer and  
which is subject to the requ irements of any of the regulatory acts.  
 
3.24 Separate technical unit:  
 A device subject to the requirements of a regulatory act and intended to be part of a trailer, 
which may be type -approved separately, but only in relation to  one or more specified types of  
trailer where the regulatory act makes express provisions for so doing.  
  
3.25 Information document :  
The document set in the corresponding Annex to a separate directive, or regulation that 
prescribes the information to be supplied by an applicant, it being permissible to supply the 
information document in the form of an electronic file.  
 
 
 
3.26 Manufactu rer: 
The person or body who is responsible to the approval authority for all aspects of the type  
approval or authorization process and for ensuring conformity of production. It is not essential 
that the person or body be directly involved in all stages of the construction of the vehicle,  
system, component or separate technical unit which is the subject of the approval process.  
 
3.27 Registered Laboratory:  
A laboratory accredited based on ISO 17025 by an approved body in the field of industry testing 
for trailers and semi -trailers. This lab is registered by SASO in order to approve the reports 
issued by it in the procedures of licensing a Logo usage.  
 
 
  SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  3.28 Test Report:  
A test report issued by a registered laboratory, provided that the date of issuance does not exceed 
one year at the time of applying for the license.   
 
3.29 B-train:  
two semi -trailers linked together by a fifth wheel .   
 
3.1.30 Double trailer  truck:  
An articulated transport vehicles as specified in SASO  469, which  used to transport goods on 
specified routes after obtaining a permit to run on roads from the concerned authorities in the 
KSA .  
All axels in double trailer truck should have  double tyres except the steering motor axle, and 
the tractor or truck used shall have at least two rear axles.  
The components in the Double trailer truck (trailers, semitrailers, dolly, B -train) should be 
manufacture by an authorized Manufacturer and approved by the Registered Laboratory in 
accordin g to the requirements set by SASO . 
  
3.1.31 long vehicle sign:   
Plate fixed on front and back of the double trailer  truck with a phrase "long vehicle" in Arabic 
and English with a minimum  length  (102) cm an d minimum height  (50) cm and in letters of 18 
cm in height, so that the floor of the plate is in reflective yellow and the writing is in black color.  
   
4. DIMENSIONS  
 
4.1 All dimensions shall be determined with the trailer at its unladen mass.  
  
4.2 None of the outward -opening windows or ven tilators and wing mirrors shall protrude by 
more than 300 mm outward from the outerm ost point on both sides, of the vehicle, and by more 
than 300 mm upward from the highest top point of the vehicle. In the case of  rear-wing mirrors 
attached to a tractor towing a trailer with a width  exceeding that of the tractor, a protrusion of 
these mirrors not exceeding 300 mm form the outer most point on both sides of the trailer may 
be allowed.  
 
4.3 The vehicle length shall be the distance between two vertical planes perpendicular to the 
longitudinal median plane and touching the front and rear of the vehicle respectively and it shall 
not exceed 20m for trucks and trailers, 23m for tractor and semi -trailers , 25.25m for Double 
Trailer Truck provided that the maximum parts length s as specified  in SASO 469. 
4.4 The vehicle width shall be the distance between two planes parallel to the longitudinal 
median plane and touching the vehicle on either side of t he said plane and it shall not exceed  
2.6m.  
 
4.4.1  All part of the vehicle including any lateral projecting of fixed parts (wheel hubs, door 
handles, bumpers, etc.) are contained between these two planes.  
4.5 The height of the vehicle shall be the dista nce between the supporting surfaces and the 
horizontal plane touching the topmost part of the vehicle and it shall not exceed 4.5 m.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  4.5.1  When measuring the vehicle structural height all fixed parts of the vehicle is contained 
between these two planes.             
4.6 For vehicles with dimensions exceeding the limits given in standard and which are 
necessarily needed for use, an approval from the authorities responsible for transportation shall 
be attained prior to their clearance and use on roads.  
FOR D ETAILED REQUIREMENTS FOR DIMENSION REFER TO SASO 469, SASO GSO 42 
AND SASO ISO 612.  
 
5. MINIMUM ROAD CLEARANCE    
5.1 Any part other than the earth -touching parts of a vehicle shall have adequate clearance above 
the ground so as to ensure safe driving.  
5.2 The clearance shall be such that any rigid parts of the vehicle should not touch the level 
ground and get damaged due to impact.  
5.3 Due to design constriction any projecting parts should be provided with guards to avoid the 
rigid part being affected for safety reasons.   
  
6. GROSS VEHICLE AND AXLE WEIGHT  
  
6.1 The Gross Vehicle Weight is the maximum weight of the fully laden vehicle, based on 
its construction and design performances, as declared by the manufacturer. This shall be 
less than or equal to the sum of the maximum axles capacity. The gross vehicle wei ght 
shall not exceed the limits as specified in SASO 469.   
6.1.1  Subject to Article (6.1), the maximum vehicle weight of a double trailer truck shall not 
exceed the limits as specified in SASO 469 . 
6.2 The Unladen Vehicle weight shall be determined by the following criteria:   
 
6.2.1  Weight of the vehicle with bodywork and all factory fitted equipment, electrical and 
auxiliary equipment for normal operation of vehicle, including liquids, tools, fire extinguisher, 
standard spare parts, chocks and spare wheel, if fitted.  
  
6.2.2  The fu el tank shall be filled to at least 90% of rated capacity and the other liquid containing 
systems to 100% of the capacity specified by the manufacturer.  
 
6.3 The design and weight carrying capacity of the axles shall be suitable to the gross axle 
weights allowed by the manufacturer.  
 
6.4 The trucks/tractor with trailer fully loaded shall be capable of ascending not less than 15% 
grade ability.  
 
6.5 Front supports of semi -trailers (standing legs) and lifting gears shall be capable of 
supporting the semi -trailers fully loaded plus 10% in excess of load.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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6.6 For vehicles with weight exceeding the limits given in standard and which are necessarily 
needed for use, an approval from the authorities responsible for transportation shall be attained 
prior to their clearance and use on roads.  
  
6.7 Maximum axle weights   
6.7.1  Maximum axle (s) capacity of a vehicle is the permissible weight corresponding to th e 
maximum weight to be carried by the axle (s) as defined by the vehicle manufacturer, not 
exceeding the axle manufacturer’s specifications. The maximum axle(s) capacity shall be less 
than or equal to the sum of the maximum capacities of the tyres.  
  
6.7.2  In the case of tandem axles the total weight on the tandem axles shall be in depend on the 
distance between the two rears axles or the distance between the first and the third rear axles.  
  
FOR DETAILED REQUIREMENTS FOR WEIGHTS REFER TO SASO 469 AND SASO  GSO 
42.  
  
7. STABILITY  
7.1 The trailer  should not pull to left or right during driving.  
  
7.2 Any vehicle in the unladen and laden state shall not overturn when tilted to the left or right 
side at an angle specified in the regulation (35  ̊ ) or the rollover stability of the shall be such the 
point at which overturning occurs should be limited to t he lateral acceleration.   
 
7.3 MANEUVERABILITY REQUIREMENTS  
7.3.1  Any motor vehicle and any semi -trailer must be able to maneuver on either side for a 
complete circular trajectory of 360° inside an area defined by two concentric circles, the outer 
circle having a radius of 12.50 m and the inner circle having a radius of  5.30 m, without any of 
the vehicle's outermost points (with the exception of the prot ruding parts prescribed for the  
vehicle width in a paragraph 4.4) projecting outside the circumferences of the circles.  
 
7.4 Tractor - trailer combination shall comply wit h the maneuverability requirements, as laid  
with Figure (3).  
 
7.5 The location of the center of gravity (CG) of a road vehicle, as defined in ISO 3833.  A 
method for determining the coordinates of the CG in the horizontal plane is provided. Two 
methods for  determining the height of the CG above the ground are specified. The axle lift and 
the stable pendulum methods are the most common methods for determining vehicle CG height.  
 
7.6 Tipper trailer fully loaded shall not overturn during discharging when the t ipper body reach 
the highest position.  
  SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  FOR MORE DETAILED REQUIREMENTS FOR STABILITY REFER TO SASO GSO 
42, SASO ISO 8855 AND, SASO ISO 10392.  
8.  ELECTRIC SYSTEM  
8.1 The electric supply system shall be such that it is suitable (Ah) to the vehicle capaci ty, fixed 
firmly, provided with suitable fuses, the current supply without any overheating, which may 
result in fire.  
8.2 The resistance between all exposed conductive parts and the electrical chassis shall be lower 
than 0.1ohms when there is current flow  of at least 0.2amps in the case of hybrid vehicles.  
8.3 The electrical cables provided shall be suitable for the current carrying capacity and 
additionally protected to avoid any leak of current.  
8.4 The trailer with batteries at the rear shall be provi ded with additional safety cut off devices 
near the battery to cutoff the supply in case of an impact and the current supply cable severed.  
8.5 Electrical parts should be provided with a protection enclosure against access external 
influences, foreign obj ects and/or water.  
8.6 The electric wiring on the outside of the body, or in any part of the trailer vehicle containing 
dangerous materials, shall be protected by an electrically insulated cover resistant to fire and 
firmly fixed to the vehicle body. The size of conductors shall be large enough to avoid 
overheating. Circuits shall be protected by fuses or automatic circuit breakers.  
8.7 The battery terminals shall be electrically insulated or covered by the insulating battery box 
cover. They shall be fitt ed in a vented box.  
8.8 Lamp bulbs with screw cap shall not be used.  
8.9 A switch for breaking the electrical circuits shall be placed as close to the battery as 
practicable.  
FOR DETAILED REQUIREMENTS ON ELECTRIC SYSTEM REFER TO SASO GSO 
42 AND SASO ISO 20653.    SASO STANDARD                                                                                SASO 2910/2018  
       
  
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9. BRAKING SYSTEM  
  
9.1 The braking system provided to the trailer shall be suitable to the vehicle concern and ensure 
safe braking performance under normal and emer gency conditions.  
9.2 Every trailer shall be equipped with service brake system adequate to control the movement 
of, and to halt it safely, speedily and effectively whatever its speed and load, on any up or down 
gradient.  
9.3 The secondary braking system  is required and shall make it possible to halt the vehicle 
within a reasonable distance in the event of failure of the service braking system.   
9.4 No material affecting the public health, directly or after reaction with other components 
such as asbestos and cadmium, shall be used in the brake system.  
 
9.5 The control of the service braking device shall be independent of the control of the parking 
braking device.  
 
9.6 Brake pipes shall be so attached to the chassis or equivalent that they are not unneces sarily 
subjected to damage through vibration or abrasion and shall be made of materials resistant to 
corrosion or treated by any process which ensures such resistance.  
 
9.7 The parking braking system shall make it possible to hold the vehicle stationary o n an up or 
down gradient of 18% even in the absence of the driver, the working parts being then held in 
locked position by a purely mechanical device. In the case of vehicles with trailers, the gradient 
will be 12%.  
9.8 The trailers category O3, O4 shall be provided with Anti -lock braking system (ABS).   
9.9 The connections of the compressed -air braking systems between power -driven vehicles and 
trailers shall be provided according to choose one of the follow paragraphs:  
9.9.1  One pneumatic supply line and one pneumatic control line.  
9.9.2  One pneumatic supply line, one pneumatic control line and one electric control line.  
9.9.3  One pneumatic supply line and one electric control line.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
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  The SASO REGULATION ON BRAKE IS UND ER PREPARATION UNTIL SUCH 
TIME .  
VEHICLES SHOULD COMPLY WITH REQUIREMENTS OF BRAKE OF ECE OR 
FMVSS REGULATIONS.  
  
FOR DETAILED REQUIREMENTS ON BRAKING SYSTEM REFER TO SASO GSO 
42 AND ECE 13.  
  
10. SUSPENSION SYSTEM  
  
10.1 Depending on the category of vehicle the suspension provided shall be suitable to reduce 
the shocks to the vehicle from the uneven level of the road, to reduce the load transmitted from 
the vehicle to road surface and damage the road surface and to drive the vehicle safely.  
 
10.2 Every trailer vehicle shall be equipped with springs and shock absorber or any other shock 
absorbing system which has adequate capacity depending on the GVW of the vehicle, against 
the impact from the ground and can ensure safe d riving on uneven and rough road.  
 
10.3 The suspension system provided for trailer  used in construction sites shall be suitable to 
carry the maximum load applied and the rough terrain in which they are used .  
10.4 The durability of the suspension system sh ould be tested by carrying out durability tests in 
accordance with the relevant international and manufacturer's specifications.  
  
11. FRAME AND BODY  
  
11.1 The frame and body shall be so secure and strong enough as to fully withstand the operation 
of the trailer.  
11.2 The chassis shall be strong enough to carry the maximum load applied to the trailer in use.  
11.3 The flooring in all trailers shall be substantially constructed in good conditions according 
to purpose used.  
11.4 The trailers and its body  shall be suitable with respect to the GCC terrain, operating 
conditions and climatic conditions prevailing in GCC countries.  
11.5 Trailers shall be mounted with rear and side shields (rear and side under - run protections) 
to protect against under running  of vehicles in the event of rear or side collision.  
11.6 All vehicles carrying goods , including tankers, mobile cranes, mobile workshops, trailers 
and semi -trailers of maximum mass exceeding 3.5 tones shall be equipped with rear under run 
protective devices to protect against under running of vehicles in the event of rear collision with 
passenger cars, multi -purpose vehicles and light duty trucks having a maximum mass not 
exceeding 3.5 tones.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
 15 
  11.6.1  The maximum mass of a trailer type for which the rear underrun protective device to be 
installed shall not exceed the value indicated on the rear underrun protective device for which 
it is designed for.  
11.6.2  The rear under run protective device to be installed to the trailer shall be suitable to the 
trailer to prevent under running of light duty vehicles. Its surface shall be made of a refle ctive 
type.  
11.7 Lateral protection fix to all vehicles carrying goods, including tankers mobile cranes, 
mobile workshops, trailers and semi -trailers of maximum mass exceeding 3.5 tones shall be 
constructed and equipped in such a way as to offer, througho ut their length, at both sides 
effective protection to unprotected road users against the risk of falling under the sides of the 
vehicle and being caught under the wheels.  
11.7.1  Components permanently fixed to the trailer, e.g. spare wheels, battery box,  air tanks, 
fuel tanks, lamps, reflectors and tool boxes may be incorporated in the guard, provided that they 
meet the dimensional requirements of this Regulation. The requirements of items from 4.2.5 to 
4.2.8 at SASO GSO 2113 shall generally apply as rega rds gaps between protective devices and 
permanently fixed components.  
 
11.7.2  The outer surface of the LPD shall be smooth, and so far, as possible continuous from 
front to rear and its surface shall be made of a reflective type.  
 
11.7.3  Lateral Protection Device (LPD) shall be essentially rigid and shall be mounted securely 
without any vibration in normal use of the vehicle. It shall be made of metal or any other suitable 
material.     
  
11.8 Spray -suppression devices must be constructed  in such a way that they operate properly 
when used normally on wet roads. Moreover, the automotive trailer manufacturing they must 
incorporate no structural or defect detrimental to their proper functioning or behavior.  
 
11.9 Every trailer vehicle used f or transporting dangerous materials shall carry markings 
indicating the nature of the load and the class of hazard in accordance with the relevant SASO 
standard.  
 
11.10  for tankers carrying fuel and equipped with auxiliary equipment “e.g. pumps” it should  
be constructed in compliance with NFPA 385 chapter 8 ( NATIONAL FIRE PROTECTION 
ASSOCIATION ).  
 
Note: Tanker shell shall be made from aluminum alloys with shiny bright finish.  
Note: It will be stopped working for tankers constructed from steel by the end of 2020 and 
should be replaced by tanks manufactured from aluminum material.  
   
FOR DETAILED RE QUIREMENTS ON VEHICLES CARRYING DANGEROUS 
GOODS REFER TO SASO REGULATIONS SASO 1285, SASO  1286, SASO 1287, 1288 
AND SASO 2288.   
 
11.11  The rear of the trailers s hall be provided with designated location sufficient in size to fix 
the number plates made in accordance with the SASO technical regulation No. SASO 572.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
 16 
  11.12  Requirements for windows and partitions Transparent partitions and windows fitted to 
any trailer shall be:   
 
a) of safety glass that complies with the relevant requirements given in SASO ISO 3536 
standard or any alternative regulation.  
 
b) of plastics safety glazing material that complies with the r elevant requirements in SASO 
ISO 15082 standard or any alternative regulation.  
 
FOR DETAILED REQUIREMENTS ON FRAME AND BODY REFER TO SASO 572 
AND SASO GSO 42, 2113, 2114 AND SASO ISO 3536, 15082.  
  
12. COUPLING DEVICES AND TOWING METHODS  
  
 
12.1 When two or more vehicles are operated in combination, the coupling devices connecting 
the vehicles shall be designed, constructed and installed, and the vehicles shall be designed and 
constructed so that when the combination is operated in a straight lin e on a level, smooth, paved 
surface, the path of the towed vehicle will not deviate more than 76 mm to either side of the 
path of the towing vehicle.  
 
12.2 All characteristics necessary for the mounting and interchangeability of drawbar couplings 
on the f rame (cross member, drawbeam or mounting bracket) of towing vehicles for trailers 
according to the SASO ISO 3584.  
   
12.3 The manufacturer must lay down the dimensions necessary for the compatibility of 
mechanical coupling devices between light trailers or  caravans and towing vehicles, when the 
latter are fitted with a coupling ball.   
 
12.4 The maximum allowable wear and the limit dimensions of worn components of in -use 
mechanical couplings, will ensure the safe operation on the road of heavy commercial ve hicles 
fitted with such couplings.  
  
12.5 Every fifth wheel assembly shall have a locking mechanism. The locking mechanism and 
any adapter used in conjunction with it shall prevent separation of the upper and lower halves 
of the fifth wheel assembly unless a positive manual release is activated.  
 
12.6 The fifth wheel coupling pin which is used for coupling semi -trailers to prime movers, it 
should be taking into account the limitations of weight generally laid down by official 
requirements.  
  SASO STANDARD                                                                                SASO 2910/2018  
       
  
 17 
  12.7 The fifth wheel kingpin shall be equipped with all  the fixtures needed to attach it to the 
vehicle (see SASO ISO 337 and SASO ISO 4086).The method of mounting shall be identical 
to that subsequently employed on the vehicle itself.   
 
12.8 Electrical connectors that are fitted for the purpose of towing and  towed vehicles should 
be complying with 12 v systems or 24 v systems according to the trailers category applicable. 
Refer to SASO ISO 1185, 1724, 3731,4091,11446, 12098 or alternative connectors.  
 
12.9 The location for the electrical connection of the br aking systems and running gear of 
towing and towed vehicles with 12 v AND 24 v nominal supply voltage and park socket used 
to receive and store the plug when disconnected according to ISO 4009 standard or any 
alternative regulation.   
 
12.10  The locations of coupling devices for electrical and pneumatic connections between 
towing and towed commercial road vehicles. It is applicable to heavy vehicles equipped with 
pneumatic braking systems and 24 V electrical equipment of the following types: drawbar -
trailer  combinations whose towing vehicles have rear -mounted couplings or couplings mounted 
forward and below, and articulated vehicles according to standard.  
 
FOR DETAILED REQUIREMENTS COUPLING DEVICES AND TOWING 
METHODS REFER TO SASO ISO 337, 1103,1726,3584,3842,4086,7638,8716, AND TS 
20825.  
 
13. WHEELS (TYRES AND RIMS)  
  
13.1 Tyre/wheel combination recommended by the manufacturer should suitable and indicate  
size designation, load -capacity index, speed category symbol, rolling resistance in accordance 
with accepted SASO standard.  
 
13.2 The tyres shall withstand endurance test, high speed performance test, Bead unseating tests, 
Strength tests, Temperature res istance tests, rolling resistance and wet grip tests specified in 
ECE 117.  
 
13.3 Retreaded tyres shall display on both sidewalls in the case of symmetrical tyres and at least 
on the outer sidewall in the case of asymmetrical tyres.  
 
13.4 The retreaded pn eumatic tyre accepted for trailer category O3, O4.  
  
13.5 The trailers shall be provided with spare tyre.  
  
FOR DETAILED REQUIREMENTS ON WH EELS REFER TO SASO REGULATIONS 
SASO 1134, 1135,1136,1275,1771, AND SASO GSO ECE 117 AND SASO ISO 4107.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
 18 
   
14. LIGHTING EQUIPMENT  
14.1 General  
14.1.2  The lighting equipment shall be so fitted that under normal conditions of use and 
notwithstanding any vibrations to which they may be subjected in such use their satisfactory 
operation remains assured and they r etain the photometric characteristics prescribed in SASO 
GSO 42 standard.  
14.1.3  Lighting equipment mounted in pairs shall be of the same colorimetric requirements and 
symmetrically appropriate photometric characteristics.  
        14.2 A summary of the r equirements for each type of lamp and reflector is given in the  
following table.  
 
   Item  Location of  
emitted light   color   Description  
    
- Clearly visible even in day time 
from a distance to be clearly  
 01 Stop lamp (brake  
lamp)  Each side at  
the Rear   Red color  identified by the vehicles coming  
 behind to avoid any rear impact.  
- should be actuated upon  
application of the service brake.  
    - Clearly visible at night at a 
suitable distance to the rear to  
    02  Rear position lamp  Each side at 
least one at the  
rear  Red color   avoid any rear impact.  
- shall be wired so that it will light 
simultaneously on both sides with 
the front position  lamps.  
     - It is optional for category O1. 
- The intensity of the reversing   
lamp shall be not greater than  
   03  Reversing lamp  Not more than 
two lamps at  
 the rear  White  
color   5000 candles.  
- give a clear vision to rear 
when  reversing.  
- for the all vehicle with length 
exceeding 6,000 mm, two devices 
mandatory and two devices  
optional.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
 19 
  04 Direction Indicator  
 Lamp  Two mounted 
on the rear  
 Amber/red  
color  - The intensity of the direction 
indicator lamps shall be such that it 
will be visible from any height  
not more than 2.5 meters above the 
ground at a safe distance to the rear.  
- Front and rear direction indicator 
lamps shall, when in operation, be 
visible, even in daytime.  
The direction indicator lamps may 
be so designed and constructed that 
they also act as the hazard warning 
flashing lamps.  
- The signal shall be given by 
simul taneous operation of the 
direction indicator lamps. - Hazard 
warning flashing lamps shall 
comply with the requirements of 
direction indicator lamps.  
- if a power -driven vehicle is  
05 Hazard warning  
flashing lamp  Two mounted 
on the rear  
 Amber/red  
color  equipped to draw a trailer the 
hazard warning signal control shall 
also be capable of bringing the 
direction -indicator lamps on the 
trailer into action.  
- hazard warning signal shall be 
able to function even if the device 
which starts or stops the engine is in 
a position which makes it 
impossible to start the engine.  
  
  06  Clearance lamp  Each side one at 
the front and  
rear Front 
display an  
amber or 
white  
 color.  
Rear 
should be 
amber or  
red color.  - Equipped for trailer, semi 
trailers  if width exceeding 2.1 m. - 
it should be mounted so as indicate 
the extreme width on the  
 trailer vehicle.  
- The intensity of the 
clearance lamp shall be clearly 
visible night at a sufficient distance 
to avoid any accident by other  
vehicles.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
 20 
    07  Side marker lamps  
  
  
 And front and rear  
side marker  
 lamps  
  
  
  
  
  Front and 
center  
amber  
color and  
 the rear  
Red or 
amber  
 color  
  - Any vehicle exceeding 6m 
in length shall be equipped with 
front and rear side marker lamps or 
side reflectors on both sides of 
vehicles.  
- The side marker lamps shall 
be clearly visible at night at a 
suitable distance from the side of 
the vehicle to avoid a ny accidents.  
 07.1  side reflector  On both sides of 
vehicle for  side 
reflectors  Front and 
center  
reflect 
amber  
color and  
the rear  
 reflect  
Red or 
amber  
 color  
  - The side reflectors shall be clearly 
visible at night at a sufficient 
distance from the side of the vehicle 
to avoid any accident when 
illuminated by head lamp beams.  
  
  08 Rear registration plate  
 lamp  In the rear 
registration  
number plate  White  
color  - making it clearly visible from a 
distance of 20 meters to the rear. - 
The registration plate lamp shall 
be wired so that it is on when the 
head lamps and front and rear 
position lamps are on.  
  
  09  Rear fog lamp  A minimum  
 one in the rear   Red color  - The rear fog lamp is optional 
provided if the intensity of the rear 
lamps complies with the SASO 
regulation.  
                 
  
FOR DETAILED REQUIREMENTS ON LIGHTING EQUIPMENT REFER TO SASO 
ISO 303. SASO GSO 42, SASO GSO ECE 48 AND SASO ISO 13207.  
  
  
15. INCOMPLETE VEHICLES  
15.1 The incomplete trailer vehicles shall be completed in accordance with the technical 
information and i nstructions supplied by the incomplete vehicle manufacturer.  
15.2 The manufacturer shall supply the following information:  
15.2.1  The gross vehicle weight rating of the completed trailer vehicle for which the incomplete 
vehicle is manufactured.  
15.2.2  Gross axle weight rating for each axle of the completed trailer vehicle.   SASO STANDARD                                                                                SASO 2910/2018  
       
  
 21 
  15.2.3  A complete manual containing a technical instruction for completing the trailer vehicle 
for its intended purpose.  
15.3 The final stage manufacturer shall complete the trailer vehicle in accordance with the 
instructions supplied by the incomplete trailer vehicle manufacturer.  
15.4 A label shall be affixed by the final stage manufacture in accordance with the relevant 
SASO regulation.  
FOR DETAILED REQUIREMENTS ON VEHICLES MANUFACTURED IN MULTI 
STAGE REFER TO SASO REGULATIO (SASO 703).  
 
16. VEHICLE IDENTIFICATION NUMBER (VIN)  
16.1 GENERAL REQUIREMENTS  
Each manufacturer trailer should have Identification number (VIN) assigned by the 
manufacturer according to SASO standard SASO -2249.                              
16.1.2  Each trailer manufactured in one stage shall have a VIN assigned by the manufacturer.   
16.1.3  Each trailer manufactured in more than one stage shall have a VIN assigned by the 
incomplete vehicle manufacturer.  
16.1.4  Each VIN shall consist of seventeen (17) characters.  
16.1.5  The check digit shall appear in position nine (9) of the VIN.  
16.1.6  The VINs of any two vehicles manufactured within a 30 -year period shall not b e 
identical.  
16.1.7  Only the following Arabic numerals and capital roman letters shall be used in the VIN:   
0123456789.  
ABCDEFGHJKLMNPRSTUVWXYZ.  
16.1.8  The VIN content shall consist of four (4) sections.  
  
16.1.9  The VIN location shall be readable from outside according to SASO 2251 paragraph  
4.1.2 .  
 
16.1.10  Each vehicle must have its own special number engraved or engraved on the internal 
frame structure or on any other similar body, on the left side of the veh icle, as determined by 
the manufacturer.   
                            See table 1 & 2 for sample deciphering submission.  
FOR DETAILED REQUIREMENTS FOR VEHICLE IDENIFICATION NUMBER 
(VIN) REFER TO SASO 2249, SASO 2250, AND SASO 2251.    SASO STANDARD                                                                                SASO 2910/2018  
       
  
 22 
    
  
  
  
    SASO STANDARD                                                                                                                                                                              SASO 2910/2018  
 
  
 TABLE 1  
  Placement of information in manufacturers vin  
  
  SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 24 
  TABLE 2  
 VIN SAMPLE DECIPHERING SUBMISSION  
 Vin deciphering  
  Vin deciphering  
submission    
 1ST section      
 Position 1    WMI   Assigned by international agency  
 SAE    
 Position 2    WMI   Assigned by international agency  
 SAE    
 Position 3 *   WMI  Assigned by national organization or  
partner    
 2nd section **      
 Position 4   Type of trailer  
  
For all trailer type  
the make is   1= Ball type pull  
 2= Pintle hitch  
 3= Gooseneck  
 4= Straight semi  
 5= Fifth wheel  
 6= Kingpin  
 9= Other  
 Position 5   Body type  A = Snowmobile trailer  
B = Boat trailer  
C = Car hauler trailer  
D = Dump trailer  
E = Enclosed trailer  
F = Flatbed trailer  
G = Curtain side trailer  
H = Hydraulic dovetail  
J = Double drop trailer  
K = Camper trailer  
L = Lowboy trailer  
M = Motorcycle trailer  
N = Livestock trailer  
P = Pole trailer  
R = Reel trailer  
S = Stacker trailer  
T = Tank trailer  
U = Utility trailer  
V = Straw trailer  
W = Landscape trailer X = Logging trailer  
Y = Satellite trailer  
Z = Converter dolly  
  
  
    SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 25 
   
 Position 6  Length  
 
Remark 1  
 
the manufacture  
should specify the  
actual length in the 
technical  
information list.  
   2= 2 meter long  
3= 3 meter long  
 A= 9 meter long  
 Position 7   Type of material   A= Aluminum  
 B= Stainless steel  
 C= Carbon steel  
 D= Fiberglass/composite  
 9= Other  
 Position 8   Number of axles   1= Single Axle  
 2= 2 Axles  
 3= 3 Axles  
 3rd section      
 Position 9   Check digit  Must Calculate for each VIN refer to SASO  
2249 4.2.3  
 4th section      
 Position 10   Model year   Per regulation:  
   code   Model year   code   Model year   
 K  2019   Y  2030  
 L  2020   1  2031  
 M  2021   2  2032  
 N  2022   3  2033  
 P  2023   4  2034  
 R  2024   5  2035  
 S  2025   6  2036  
 T  2026   7  2037  
 V  2027   8  2038  
 W  2028   9  2039  
 X  2029      
 Position 11   Plant location    code  Regain   
 A  ASIR  
 B  AL-BAHAH  
 C  AL-QASSIM  
 D   NORTHERN BORDER  
 E   EASTERN  
 G  JIZAN   
 H  HAIL  
  K   MAKKAH  
 M  AL-MADINAH    SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 26 
   N  NAJRAN  
 R  RIYADH  
 T  TABUK  
 W  AL-JAWF  
 Position 12 *   WMI  Assigned by national organization or  
partner    
 Position 13 *   WMI  Assigned by national organization or  
partner    
 Position 14 *   WMI  Assigned by national organization or  
partner    
Position 15.16. and  
17 Sequentially  assigned 
number   001, 002, 003, ETC….  
The first vehicle of any model year will be  
001.the  second will be 002. And so ….  
  
  * =     IF A MANUFACTURE PRODUCES LESS THAN 500 VEHICLES IN A YEAR the WMI is assigned      
by international agency SAE.  
     ** =   The layouts shown in 2nd section as attributes is given as deciphering submission examples only and are 
not restrictive.    
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
    SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 27 
  17. COMPLIANCE PLATE   
  
17.1 Every applicable trailer shall bear an Approved Compliance Plate which shall be placed in a 
conspicuous position on the trailer.  
17.2 The manufacturer shall affix, on the chassis of the trailer, a label meeting the following 
requirements:   
17.2.1  It shal l be made of material resistant to deterioration.  
17.2.2  The label shall, unless riveted, be permanently affixed in such a manner that it cannot be removed 
without being destroyed.  
17.2.3  The following information shall be written (in Arabic or English language) in letters at least  
2.4 mm high and in a clearly legible manner:  
17.2.3.1  Name of manufacturer and country of manufacture (or assemble).  
17.2.3.2  Year and month of production.  
17.2.3.3  Maximum (gross) vehicle weight (GVW) in kilograms.   
17.2.3.4  Maximum (gross) axle weight (GAW) for each axle, in kilograms.  
17.2.3.5  The trailer identification number.  
17.2.3.6  The category of trailer.  
17.2.3.7  The statement “This trailer conf orms to all applicable SASO standard and Technical 
Regulations in effect up to the date of manufacture” referred to table - 3.  
17.2.4  Additional information may be included at the discretion of the Manufacturer.  
17.2.5  In the case all of the information required by manufacturer is contained in the ‘Compliance Plate’ 
a separate vehicle plates need not be fitted.  
FOR DETAILED REQUIREMENTS ON COMPLIANCE PLATE REFER TOSASO 
REGULATIONS SASO 400 AND SASO GSO 42.  
  
                               
    SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 28 
   
  
  
Fig-1 & Fig -2 
For brake and electrical connections locations  
  
  SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 29 
   
  
  
  
  
  
Fig.3 Vehicle maneuverability  
 
R= 12.5 m  
  
U = max. 1.2 m  
  
Rb = min. 5.3 m  
  
  
    SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 30 
    
  
TABLE – 3 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  SASO STANDARD                                                                                           SASO 2910/2018  
     
  
 31 
    
  
  
 REFERENCE  
  
  
  
  
ECE 13  Uniform provisions concerning the approval of vehicles of 
categories M, N and O with regard to braking.  
ISO 4009  Commercial vehicles — Location of electrical and 
pneumatic connections between towing vehicles and trailers.  
Directive 96/53 /EC, of 25 July 1996 Article 4, § 4 (b)