SASO STANDARD   SASO  000000:2021  
 
 
 الهيئة السعودية للمواصفات والمقاييس والجودة  
Saudi Standards, Metrology and Quality Org (SASO)  
 
  
  
  
  
 
  
  
SASO/CD 32181 (E)  
  
  
  
  
السيارات- حواجز الحماية الجانبية للشاحنات والمقطورات   
Motor Vehicles -Lateral  Underrun Protective Devices 
for Trucks and Trailers  
   
   
   
   
   
   
   
   
   
  
  
   
   
ICS:  43.040.60  
 
THIS DOCUMENT IS A DRAFT SASO STANDARD CIRCULATED FOR 
COMMENT. IT IS, THEREFORE SUBJECT TO CHANGE AND MAY 
NOT BE  REFERRED TO AS A SASO STANDARD UNTIL APPROVED 
BY THE BOARD OF DIRECTOR      
   
   
   SASO STANDARD   SASO  000000:2021  
 
 
 مقدمة 
قامت بالهيئة السعودية للمواصفات والمقاييس والجودة بإعداد مشروع المواصفة القياسية السعودية " 
السيارات - حواجز الحماية الجانبية للشاحنات والمقطورات  " عن طريق الفريق الفني لمركبات الطرق   
بعد استعراض المواصفات القياسية العربية والأجنبية والدولية والمؤلفات المرجعية ذات الصلة على أن 
تلغي هذه المواصفة القياسية السعودية. SASO GSO 211 3:2011  
 
Foreword 
The Saudi Standards, Metrology and Quality Organization (SASO) has 
prepared the draft of  Saudi Standard " Motor vehicles - Lateral Underrun 
Protective Devices for Truc ks and Trailers  " by technical  committee  of road 
vehicle  based on relevant ADMO, International and National foreign 
Standards and references. These standards will be  replace SASO GSO 
2113:2011.  SASO STANDARD   SASO  000000:2021  
 
 
  1  
Motor vehicles - Motor Vehicles -Lateral Underrun Protection Devices for 
Truck and Trailer  
  
1-  SCOPE AND FIELD OF APPLICATION   
  This standard  is concerned with the requirements for the lateral protection  devices  
(side guards) of vehicles  categories N2, N3, O3 and O4 (1);  
                   This standard  does not apply to tractors for semi -trailers and vehicles designed and 
constructed for spe cial purposes where it is not possible for practical reasons to fit 
such lateral protection  
2-  COMPLEMENTARY REFERENCES   
2.1  SASO  469 “Motor Vehicles - Weights and Dimensions”.  
2.2             SASO Technical Regulation for Front, Rear and Side Barriers  for Trucks and   
Trailers.   
3-  DEFINITIONS  
3.1  Motor vehicle:  A vehicle, excluding motorcycles or trailers, operated by means of 
a motor without dependence on rails, cables or similar guides.  
3.2  Truck:  A motor vehicle intended for carrying goods.   It may also tow a trailer.  
3.3  Maximum weight:  The weight stated by the vehicle manufacturer to be technically 
permissible.  
3.4  Approval of a vehicle: The approval of a complete vehicle type with regard to its 
lateral protection;  
3.5  Vehicle type: A category of vehicles which do not differ with respect to the essential 
points such as the width of the rear axle, the overall width, the dimensions, the shape 
and the materials of the whole side of the vehicle (including the cab if fitted),  and 
the characteristics of the suspension in so far as they have a bearing on the technical 
requirements specified in this standard .  
3.6  Maximum mass: The mass stated by the vehicle manufacturer to be technically 
permissible (this mass may be higher tha n the "permissible maximum mass" laid 
down by the national administration);  
3.7  Unladen mass: The weight of the vehicle in running order, unoccupied and unladen, 
but complete with fuel, coolant, lubricant, tools and spare wheel, if supplied by the 
vehicle manufacturer as standard equipment;  
ـــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ  
1)  N2: Vehicles used for the carriage of goods and having a maximum mass exceeding 3.5 tonnes but not exceeding 12     
tonnes. (Commercial Truck)  
N3: Vehicles used for the carriage of goods and having a maximum mass exceeding 12 tonnes. (Commercial Truck)  
O3: Trailers  (including semi –trailers) with a maximum mass exceeding 3.5 tonnes, but not exceeding 10 tonnes  
O4: Trailers (including semi –trailers) with a maximum mass exceeding 10 tonnes 
 SASO STANDARD   SASO  000000:2021  
 
 
  2 3.8  Unprotected road users: The pedestrians, cyclists or motor cyclists using the road 
in such a way that they are liable to fall under the sides of the vehicle and be caught 
under the wheels.  
3.9            The definitions in SASO Technical Regulation for Front, Rear and Side Barriers for 
Trucks and Trailers . 
4-  REQUIREMENTS  
  The following shall be met.  
4.1  General  
4.1.1  All vehicles carrying goods, including tankers, mobile cranes, mobile workshops, 
trailers and semi -trailers shall be constructed and equipped in such a way as to offer, 
throughout 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. This shall be complied by providing one of the following:  
4.1.1.1  The vehicle is equipped with a special lateral protective device (side guards) 
according to the  technical requirements specified in item 4.5.  
4.1.1.2  If the vehicle is so designed and/or equipped at the side that by virtue of their shape 
and characteristics, its component parts can be incorporated and/or regarded as 
replacing the lateral protectiv e device and comply with the requirements specified 
in item 4.5. 
4.2 Material  
4.2.1 The mechanical properties of the underrun protective device's material shall be 
either hot rolled high strength Steel with a minimum yield strength of 350 N/mm2 
and minimum  tensile strength of 480 N/mm2 or high strength Aluminum Alloy with 
a minimum yield strength of 350 N/mm2 and minimum tensile strength of 480 
N/mm2. 
4.2.2 The minimum mechanical properties of bolts should be made of Low -carbon 
martensite with 10.9 class bo lt with minimum proof strength of 830 N/mm2, 
minimum yield strength of 940 N/mm2 and minimum tensile strength of 1040 
N/mm2.  
4.3 Welding  
4.3.1  Welding could only use between the UPD and the bridge/support. It is strictly 
prohibited to weld the UPD or the bridge/support to the chassis of the truck or 
trailer.  
4.3.2  Welding should be fully welded. ( Figure  1) 
4.3.3  Welding thickness (h) should be compatible between the bridge/support and the 
UPD. ( Figure  2) 
4.3.4  The minimum requirements for the welder wire's  material used in welding is AWS 
electrode number (E90xx), with minimum yield strength of 531N/mm2 and 
minimum tensile strength of 620N/mm2. 
4.4 The retro -reflective marking (Tape)  SASO STANDARD   SASO  000000:2021  
 
 
  3 4.4.1  The retro -reflective marking (Tape) should be on the UPD, so that it can be seen at 
night or when the visibility is not clear.  
4.4.2 The retro -reflective marking (Tape) should be yellow. The width of a side tape 
material shall be 5 0 mm or 10 0mm, with tolerance +2 mm depend on the type of 
trucks or trailers. It should be com plied with the Saudi Standard (SASO 2913).   
4.4.3  Width of the Retro -Reflective Marking (tape) used on the lateral underrun 
protective device for trucks less than 12 tons  and trailers less than 10 tons  is 50 mm , 
and 100 mm for trucks greater than 12 tons a nd trailers greater than 10 tons.  
4.5 LUPD Technical requirement      
4.5.1  The side guard shall not increase the overall width of the vehicle.  
4.5.2  The main part of side guard’s outer surface shall not be more than 120 mm in board 
from the outer most plane of the vehicle. (Figure  4) 
4.5.3  The side guards forward end may be turned inwards in accordance with the 
requirements mentioned below.  
4.5.4  The side guard’s rearward end shall not be more than 30 mm in board from the 
outermost edge of the rear tyres over at least the rearmost 250 mm. (Figure  4) 
4.5.5  The outer surface of the guard shall be smooth, and so far, as possible continuous 
from front t o the rear.  
4.5.6  Adjacent parts may overlap, provided that the overlapping edge faces rearwards or 
downwards or a gap of not more than 25mm measured longitudinally may be left, 
provided that the rearward part does not protrude outboard of the forward pa rt.  
4.5.7  Domed heads of bolts or rivets may protrude beyond the surface to a distance not 
exceeding 10 mm and other parts may protrude to the same extent provided that 
they are smooth and rounded.  
4.5.8  The external edges and corners shall be rounded with a radius not less than 2.5 mm.  
4.5.9  The device may consist of a continuous flat surface or of one or more horizontal 
rails or a combination of surface and rails.  
4.5.10 The rails used shall be not more than 300 mm apart.  (Figure  5) 
4.5.11  The rail s used shall be not less than 50 mm high for vehicles having maximum mass 
less than 12 tons and trailers having maximum mass less than 10 tons.  
4.5.12  The rails used shall be not less than 100 mm high for vehicles having maximum 
mass more than 12 tons an d trailers having maximum mass more than 10 tons.  
4.5.13  The forward edge of the side guard shall be constructed and positioned in such a 
way that it will comply with the following:  
4.5.13.1  On a motor vehicle: It shall not be more than 300 mm to the rear of the vertical 
plane perpendicular to the longitudinal plane of the vehicle and tangential to the 
outer surface of the tyre on the wheel immediately forward of the guard.  SASO STANDARD   SASO  000000:2021  
 
 
  4 4.5.13.2  On a dra wbar trailer: It shall not be more than 500 mm to the rear of the vertical 
plane perpendicular to the longitudinal plane of the trailer and tangential to the outer 
surface of the tyre on the wheel immediately forward of the guard.  
4.5.13.3  On a semi -trailer: It shall not be more than 250 mm to the rear of the transverse 
median plane of the support legs, if support legs are fitted, but in any case the 
distance from the front edge to the transverse plane passing through the centre of 
the kingpin in its rear most position may not exceed 2.7m. Construction:  
4.5.13.4  When the forward edge of the guard lies in an open space, the edge shall consist of 
a continuous vertical member extending the whole height of the guard, the outer 
and forward faces of this vertic al member shall measure at least 50 mm rearwards 
and be turned 100 mm inwards in the case of trucks having maximum mass of 3.5 
tons to 12 tons and trailers having maximum mass of 3.5 tons to 10 tons.  
4.5.13.5  The outer and forward faces of this vertical member in item 4.5.13.4 shall measure 
at least 100 mm rearwards and be turned 100 mm inwards in the case of trucks 
having maximum mass exceeding 12 tons and trailers having maximum mass 
exceeding 10 tons.  
4.5.13.6  On a motor vehicle if the forward edge o f the guard which is 300 mm dimension 
falls within the cab, the guard shall be so constructed that the gap between its 
forward edge and the cab panels does not exceed 100 mm and it shall be turned in 
through an angle not exceeding 45o.  
4.5.13.7  On a motor vehicle if the forward edge of the guard which is 300 mm dimensions 
falls behind the cab and the side guard is extended forward to within 100 mm of the 
cab, then the provisions of the previous item shall be met.  
4.5.13.8  On a central axle trail er: in the area forward of the transverse plane passing through 
the centre of the front axle but not more than the front of the bodywork, if any, to 
ensure the normal manoeuvrability of the trailer."  
4.5.14  The rearward edge of the side guard shall not be  more than 300 mm forward of the 
vertical plane perpendicular to the longitudinal plane of the vehicle and tangential 
to the outer surface of the tyre on the wheel immediately to the rear.  
4.5.15  The lower edge of the side guard shall be not more than 450 mm above the ground 
at any point.   
4.5.16  The upper edge of the side guard shall not be more than 350 mm below that part of 
the structure of the vehicle, cut or contacted by a vertical plane tangential to the 
outer surface of the tyres, excluding any bulging close to the ground, except in the 
following cases.  
4.5.16.1  Where the plane in the item 4.5.16 does not cut the structure of the vehicle, then the 
upper edge shall be level with the surface of the load -carrying platform, or 950 mm 
from the ground whichever is the less.  
4.5.16.2  Where the p lane in item 4.5.16 cuts the structure of the vehicle at a level more than 
1.3 m above the ground, then the upper edge of the side guard shall not be less than 
950 mm above the ground.  SASO STANDARD   SASO  000000:2021  
 
 
  5 4.5.16.3  On a vehicle specially designed and constructed, and not mer ely adapted,  for the 
carriage of a container or demountable body, the upper edge of the guard shall be 
determined in accordance with any one of the items ( 4.5.16.1 and 4.5.16.2) 
mentioned above.  
4.5.17  Components permanently fixed to the vehicle, e.g. s pare wheels, battery  box, air 
tanks, fuel tanks, lamps, reflectors and toolboxes  may be incorporated in the guard, 
provided that they meet the dimensional requirements of this satandard . The 
requirements of items from 4.5.5 to 4.5.8 shall generally apply a s regards gaps 
between protective devices and permanently fixed components.  
 
4.6  Design   
4.6.1  The side guards shall be rigid and shall be mounted securely without any vibration 
in normal use of the vehicle.   
4.6.2  The side guard shall be made of meta l material  
4.7  The side guard shall not be used for the attachment of brake, air or hydraulic pipes.  
5-  MARKING  
5.1  The marking shall be comply with SASO technical regulation forTechnical 
regulation For front, rear and Lateral Underrun Protective Devices for Trucks and 
Trailers.  
6-  DIMENSION SPECIFICATIONS   
6.1  Measuring instruments  
6.1.1 Dimensions measuring instrument  
  The instruments used shall permit measurement to an accuracy of ± 1 mm.  
6.2 Approval Dimension Specifications  
 The following  Dimension specifications design for lateral  underrun protective 
devices shall be followed at Annex 1 . 
7-  CRITERIA OF TECHNICAL CONFORMITY  
7.1  The Lateral Underrun Protection Devices shall be considered complying with all 
the requirements of this standard when the withdrawn sample from the consignment 
or the supplied sample by the manufacturer, otherwise the front underrun protective 
device shall be considered noncomplying . 
 
 SASO STANDARD   SASO  000000:2021  
 
 
  6  
 
Knowing that (h) means welding thickness.  
 
Figure  1: Approved welding  shape  
  
SASO STANDARD   SASO  000000:2021  
 
 
  7  
 
 
Where, h (welding thickness), t c (thickness of the bridge or support) and t h(thickness of 
the UPD)  
 
Figure  2: Correct methods followed in welding.  
 
 
 
 
Figure  3: The way of fixing the Retro -Reflective tape on the lateral device of the truck   
 
 
 
 
 
    
  
tc > h & th > h 
Not a correct welding  tc < h & th < h  
Not a correct welding  tc = h  & th = h when th = tc   
tc > h  & th = h when tc > th 
SASO STANDARD   SASO  000000:2021  
 
 
  8  
 
Figure  4: Top view of a truck showing the general specifications for LUPDs  
 
 
 
Figure  5: side view of a truck showing the general specifications for LUPDs   
SASO STANDARD   SASO  000000:2021  
 
 
  9 Annex 1  
Approval Dimension Specifications  
1. The following Dimension specifications design for lateral  underrun protective 
devices shall be followed.  
1.1  Visual inspection   
  The lateral  underrun protective device shall be visually examined to check for exact 
dimensions, bolts type, welding standard, any damage, crack, sharp outer edge, and 
any apparent defects.  
1.2 The mechanical properties of the underrun protective device's material shall be as 
follows:  
 
 
 
1.3 General Dimensions of LUPD  
1.3.1 The main cross -section area for the LUPD are shown in Figure 6.  
 
Figure 6: Main models of LUPD cross -sectional area.  
 
1.3.2 Dimensions of cross -sectional area  
For trucks with a weight less than 12 tones and trailers with a weight less than 10 tones.  
 
 
 
 
Table 1  
Material Used  Type  Min. Yield 
Strength  Min. Tensile 
Strength  
Steel  Hot Rolled  350 N/mm2 480 N/mm2 
Aluminum Alloy  (Al-Cu Alloy)  350 N/mm2 480 N/mm2 
Model Cross -sectional Area  D (mm)  B (mm)  C (mm)  minimum  t (mm)  
C-section  50 25 10 2.5 
Rectangle section  50 25 -------  2.5 
Round section  50 -------  -------  2.5 SASO STANDARD   SASO  000000:2021  
 
 
  10  
 For trucks with a weight more than 12 tones and trailers with a weight more than 10 tones.  
 
 
 
 
Table 2  
 
1.3.3 Different Main Models of LUPDs  
1.3.3.1 It consists of LUPD and the carrier bridge that connects the LUPD to the track or 
trailer chassis as shown in Figure 7.  
 
Figure 7: Model of LUPD for a truck or trailer.  
 
 
LUPD distances between carrier bridge . 
 
Figure 8: View showing the position of installing the LUPD to the carrier bridge  
 
 
Model Cross -sectional Area  D (mm)  B (mm)  C (mm)  minimum  t 
(mm)   
C- section  100 50 20 3.0 
Rectangle section  100 50 -------  3.0 
Round section  100 -------  -------  3.0 SASO STANDARD   SASO  000000:2021  
 
 
  11 A table clarifies the position of installing the LUPD to the carrier bridge  
 
 
 
 
 
Table 3  
 
1.3.3.2 Carrier Bridge Connecting LUPD to Truck or Trailer Chassis  (Figure 9) . 
 
Figure 9: Carrier bridge models used to connect the LUPD to the chassis of the truck or trailer . 
 
Measurements of the underrun protective device carrier bridge  
 
 
 
Table 4 
 
1.3.3.3 Connecting LUPD Parts  
 
Connection can be done by welding or using bolts as clarified in item 4.2. For bolts, they 
should be as follows:  
Table 5 
 
Type of Material  X (mm)  Maximum Y (mm)  
Steel  900 ± 100  500 
Aluminum Alloy  900 ± 100  500 
Cross -sectional area of barrier bridge  Minimum  d (mm)   Minimum  t (mm)  
Square Section  40 x 40  3 
Round Section  40 3 
Trucks with a weight less than 12 tones 
Trailers with a weight less than 10 tones  Trucks with a weight more than 12 tones 
Trailers with a weight more than 10 tones  
Number of Bolts  Bolt Diameter (mm)  Number of Bolts  Bolt Diameter (mm)  
4 12-15 4 15-18 SASO STANDARD   SASO  000000:2021  
 
 
  12 1.3.3.4 Models of Truck and Trailer LUPDs  (Figure 8) . 
 
 
Figure 8: Models of lateral truck and trailer LUPD s 
 
1.3.3.5 For further details, see (Annex 2 and 3).  
 
 
 
 
  
 
 
 
 SASO STANDARD   SASO  000000:2021  
 
 
  13 Annex 2 
Sample Models of LUPDs in Truck  
  
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  14  
  
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  15  
 
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  16  
  
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  17 Annex 3 
Implementing UPDs for Some Special Cases Types of Trucks and Trailers  
 
Case 1:  When the cab is narrower than the rear of the vehicle  
a. When the cab is narrower than the truck chassis, the forward edge of LUPD  shall 
not be less than 45° towards the cab to protect unprotected road users from the sharp 
edge that protrudes out from the cabin outer plane as shown in Figure 3.1. 
 
 
Figure 3.1  
 
 
 
b. Putting the LUPD  straight with no angle may harm unprotected road users and 
cause injuries as shown in Figure  3.2. 
 
 
Figure 3.2  
 
 
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  18  
 
 
 
Case 2:  If there is apart from the cab on the same plane as LUPD  
a. If there is apart from the cab on the same plane as LUPD, no installation  of LUPD 
is required and the part is treated as LUPD as shown in Figure 3 .3. 
 
 
 
Figure 3.3  
 
 
 
b. Putting LUPD over the part from the cab is not necessary and it leads to increasing 
the width of the vehicle as shown in Figure 3 .4. 
 
 
 
Figure 3.4  
 
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  19  
 
 
 
Case 3: When there is space below the cab  
a. In case there is an unprotected space under the cab, LUPD is extended while leaving 
no more than 300mm to protect unprotected road users as in Figure 3.5 
 
 
Figure 3.5  
 
 
 
b. If the distance between LUPD and outer surface of the front tire is more than 
300mm and vertical distance from the cab to ground is more than 450mm, it may 
harm unprotected road users as in Figure 3.6.  
 
 
Figure 3.6  
 
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  20  
 
 
 
Case 4: If the truck box is in the same plane as LUPD  
a. If there is a truck box on the same plane as LUPD, that box is treated as LUPD  and 
if the distance between the box and outer surface of the front tire is less than 300mm, 
there is no need to extend the length of LUPD  as in Figure 3.7. 
 
 
Figure 3.7  
 
 
b. There is no need to install an extra  part for the LUPD  after the truck box towards 
the front tire if the distance between them is less than 300mm as shown in Figure 
3.8. 
 
 
Figure 3.8  
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  21  
 
 
 
Case 5:  Extending LUPD  after the rear tire when needed  
a. When the distance after the outer surface of the rear tire is more than 300mm, an 
extra LUPD is installed to avoid any damages that may occur as in Figure 3.9. 
 
 
 
Figure 3.9  
 
 
 
 
b. When the area behind the rear tire is more than 300mm as shown in Figure 3.10. 
Leaving it without LUPD  may harm unprotected road users.  
 
 
 
Figure 3.10  
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  22  
 
 
 
Case 6:   Dealing with distance between the vehicle tires  
a. In case there are spaces between tires, it can be dealt with as follows:  
1. If the distance is more than 300mm, LUPD is i nstalled as shown in 
Figure 3.11. 
2. If the distance is less than 300mm, no need to install LUPD as shown in 
Figure 3.11 
 
Figure 3.11  
 
b. Putting an LUPD  between tires when distance is less than 300mm is not necessary 
as it shows in Figure 3.12  
 
 
 
Figure 3.12  
 
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  23  
 
 
 
Case 7:  Some parts of the truck that can be treated as LUPD  
a. Some parts of the truck can be treated as LUPD  and nothing is added if it were on 
the same plane as LUPD  as shown in Figure 3.13 such as:  
1. Cylindrical air tank.  
2. Silencer protection box.  
3. There is a small area between air tank and the rail that does not require 
LUPD due to its small size.  
 
 
Figure 3.13  
b. Installing a LUPD  between the air tank and the rail is not necessary as it shows in 
Figure 3.14. 
 
 
Figure 3.14  
 
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  24  
 
Case 8:  Some truck parts that cannot be treated as LUPD  and needs a LUPD  
a. The toolbox can be considered as LUPD  but it is not enough and a LUPD  must be 
installed underneath it as in Figure  3.15. 
 
 
Figure 3.15  
 
b. Not installing a LUPD may harm unprotected road users and that because it 
exceeds the allowable distance as shown in Figure 3.16 
 
 
Figure 3.16  
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  25  
 
Case 9:  The possibility of a disconnected LUPD if required  
a. LUPD  sometimes can be cut if necessary as it shows in Figure 3.17, because of a 
reflector light as in 1 or the opening of a water or fuel tank as in 2.  
 
Figure 3.17  
 
 
 
 
 
b. Trying to add an extra disconnected LUPD  is not  necessary or beneficial as shown 
in Figure 3.18 
 
Figure 3.18  
 
 
 
 
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  26  
 
Case 10:  When a LUPD  is already installed by the truck manufacturers  
a. In case the truck comes with a pre -installed LUPD  that fulfills the requirements, 
then there is no need to install another LUPD  as in Figure 3.19. 
 
 
Figure 3.19  
 
 
 
 
b. Installing a LUPD  when one is already installed on the truck is unnecessary as in 
Figure 3.20. 
 
 
Figure 3.20  
 
 
 
 
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  27  
 
Case 11:  Increasing the truck width because of LUPD  
a. When installing a LUPD, it should not be installed in a way that increases the 
vehicle width as shown in Figure 3.21 
 
Figure 3.21  
 
 
b. Installing a LUPD  in a way that increases the vehicle width is incorrect and must 
be modified as it shows in Figure 3.22 
 
 
Figure 3.22  
 
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  28  
 
Case 12:  Lower loading surface for the vehicle  
a. In case the loading surface for the vehicle is low and fulfill the pre -mentioned 
requirements, there is no need to install a LUPD as in Figure 3.23 
 
 
Figure 3.23  
 
 
b. Having an extra LUPD is unnecessary and may cause damages to the vehicle due 
to being very low and close to the ground surface as shown in Figure 3.24. 
 
 
Figure 3.24