DRAFT UGANDA STANDARD  
  DUS 2277 -1 
First  Edition  
2020 -mm-dd 
 
 
 Reference number  
DUS 2277 -1: 2020 
© UNBS 2020   
  
Road vehicles  — Maximum road speed limiters for motor 
vehicles  — Part 1: Performance and installation requirement s 
 DUS 2277 -1: 2020  
ii © UNBS 2020  – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all  necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2020   
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechan ical, including photocopying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 41 4 333 2 50/1/2/3  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  DUS 2277 -1:2020  
© UNBS 2020  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  3 
4.1 General requirements  ................................ ................................ ................................ ...........................  3 
4.2 Requirements for speed limit ers ................................ ................................ ................................ .........  4 
4.2.1  Workmanship  ................................ ................................ ................................ ................................ .........  4 
4.2.2  No effect on the normal operation of vehicle  ................................ ................................ .....................  4 
4.2.3  Compatibility with environmental conditions  ................................ ................................ ....................  4 
4.2.4  Susceptibility to tampering  ................................ ................................ ................................ ..................  4 
4.2.5  Manuals  ................................ ................................ ................................ ................................ ..................  5 
4.3.1  General  ................................ ................................ ................................ ................................ ...................  5 
4.3.3  off board data storage ................................ ................................ ................................ ...........................  6 
4.4 Conditions for authorised suppliers of  speed limiters  ................................ ................................ ...... 7 
4.4.1  Manufacturers authorization  ................................ ................................ ................................ ................  7 
4.4.2  Manufacturers’ warranty  ................................ ................................ ................................ .......................  7 
4.4.3  Establishment of fitting centers and appointing of agents  ................................ ...............................  7 
4.4.4  Change in design or construction of the approved type of speed limiter  ................................ ....... 7 
4.4.5  Training of government technical personnel  ................................ ................................ .....................  7 
4.4.6  Records  ................................ ................................ ................................ ................................ ..................  7 
4.4.7  Fitting certificates  ................................ ................................ ................................ ................................ .. 8 
4.4.8  Record of technicians  ................................ ................................ ................................ ...........................  8 
4.4.9  Calibration equipment ................................ ................................ ................................ ...........................  8 
4.4.10  The suitab ility of the speed limiter for a particular type of vehicle.  ................................ .................  8 
4.4.11  Warranty obligations  ................................ ................................ ................................ .............................  8 
4.4.12  Start of operations  ................................ ................................ ................................ ................................ . 8 
4.4.13  Poor field performance  ................................ ................................ ................................ .........................  9 
Annex  A (normative)  Sample display certificate  ................................ ................................ ..........................  10 
Annex  B (informative)  Minimum recorded/transmitted data and data format  ................................ ..........  11 
B.1 Data header  ................................ ................................ ................................ ................................ ................  11 
B.2 Reports to be recorded/transmi tted ................................ ................................ ................................ .........  11 
B.3 Commands  ................................ ................................ ................................ ................................ .................  12 
Annex  C (informative)  REQUIREMENTS FOR SPEED LIMITER FITTING CENTRES  ................................  13 
Annex  D (informative)  Sample certificate of compliance  ................................ ................................ ............  15 
Bibliography  ................................ ................................ ................................ ................................ ......................  16 
 DUS 2277 -1: 2020  
iv © UNBS 2020  – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (UNBS) is a par astatal under the Ministry of Trade , Industry and 
Cooperatives established under Cap 327 , of the Laws of Uganda , as amended .  UNBS is mandated to co -
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (I SO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT  Agreement  of the World Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Commit tees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key stakeholders 
including government, academia, consumer groups, private sector and other interested parties.  
Draft Uganda Standards adopted by  the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Counci l. 
The committee responsible for this document is Technical Committee UNBS /TC 117, Transport vessels and 
accessories  
US 2277  consists of the following parts, under the general title Road vehicles  — Maximum road speed limiters 
for motor vehicles  :  
  Part 1: Performance and installation requirements  
  Part 2 : Specification for system and component  
 UGANDA STANDARD  DUS 2277 -1: 2020  
 
© UNB S 2020  – All rights reserved  1 
 Road vehicles  — Maximum road speed limiters for motor 
vehicles  — Part 1: Performance and installation requirement s  
1 Scope   
This Part 1 of this Uganda Standard  specifies requirements for the performance and installation of devices 
designed to limit the maximum road speed of motor vehicles by control of engine power. This standard also 
specifies performance requirements of speed recording and reporting devices. T hese may be a separate unit 
to be installed on the vehicle and an add -on or on -board system built in the vehicle. This standard does not 
cover methods of test and procedure for type approval, which  are covered under WDUS 2277 -2. The two 
parts of this stand ard cannot therefore be read in isolation  
NOTE 1 unless otherwise referred to in clause 3, the device is referred to hereafter as the speed limiter.  
NOTE 2 Permitted tolerances of the system may allow the vehicle to exceed the set speed.  
2 Normative refere nces  
The following referenced documents referred to in the text in such a way that some or all of their content 
constitutes requirements of this document. For dated references, only the edition cited applies. For undated 
references, the latest edition of t he referenced document (including any amendments) applies.  
The t raffic and road safety act, 1998  (amendment) act, 2020  
US 735:2008 , Code of practice for repair and service of electrical and electronic machines/devices  
WDUS 2277 -2DUS 2277 -2, Road vehicles  — Maximum road speed limiters for motor vehicles  — Part 2: 
Specification for system and component  
3 Terms and definitions   
For the purposes of this document, the following terms and definitions apply.  
ISO and IEC maintain terminological databases for use in  standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1  
act 
The traffic and road safety act, 1998 (amendment) act, 2020 and any future amendments  
3.2  
authority  
the competent authority as defi ned in the act or any of its successor(s) post approval of this standard  
3.2  
authorized official  
authorized motor vehicle inspector or traffic police officer   
2 © UNBS 2020  – All rights reserved  
 3.3  
calibration  
comparison between an instrument and a measuring standard of higher accuracy to  detect, correlate, adjust, 
and document the accuracy of the item being compared  
3.4  
driving hours  
period during which the vehicle is in motion  
3.5  
Engine  
source (or sources) of the vehicle’s motive power  
3.6  
juddering  
action of shaking rapidly during t he retardation process  
3.7  
speed limiter supplier  
in the case of maximum road speed limiters fitted in the course of construction of the vehicle, the vehicle 
constructor. In all other cases, the limiter manufacturer or any individual or company authorize d to import 
speed limiters, open up fitting centers and or appoint agents as retailers or fitting centers  
3.8  
malfunction  
the state of a speed limiter not functioning in the intended manner either through deliberate human 
intervention (tampering) or unint ended system failure  
3.9  
maximum speed (Vmax)  
maximum speed declared by the speed limiter supplier at which the limiter may be set and meet the 
requirements of this standard and prescribed maximum speed limits for specific categories of motor vehicles 
as provided for in the act and applicable regulations.  
3.10 
set speed (Vset)  
intended mean vehicle speed when operating in a stabilized condition as defined in this standard, act and 
applicable regulations. It shall be marked on the vehicle and used for cali bration purposes  
3.11   
speed limiter  
device that shall temporarily cause the engine to lose power when the set speed is reached  
NOTE: The purpose of the speed limiter is to limit the maximum road speed for vehicles to a specified value without 
affecting the other performance parameters of the vehicle in any manner  
3.12   
speed limitation function (SLF)  
function to control the fuel feed of the vehicle or engine management in order to limit the vehicle speed to a 
fixed maximum value  
3.13   
violation  
malfunc tion (see 3.8) or any speed in the excess of 5 Km/h of the set speed (see 3.10)  DUS 2277 -1: 2020  
© UNBS 2020  – All rights reserved  3 
 4 Requirements  
4.1 General requirements  
4.1.1  The speed limiting system shall only be considered complete if it consists of the limiter and a speed 
recording, storing and trans mitting device (recorder). No speed limiting system shall be approved for use in 
Uganda unless it demonstrates full compliance with all the requirements set out in this part of this Uganda 
Standard and as tested in accordance with DUS 2277 -2.  
4.1.2  The sp eed limitation shall be such that the vehicle in normal use complies with the provisions of this 
standard. It shall be so designed, constructed, that its performance is not affected by the vibrations to which 
the vehicle may be subjected and as tested in a ccordance with  DUS 2277 -2. 
4.1.3  The speed Limiter shall be so designed, constructed and assembled and fitted to the vehicle to make 
it maximum tamper proof and “failsafe” against various factors such as disconnection/failure of various 
components e.g. pow er supply, speed sensor, mechanical actuator system, linkages or any unauthorized 
modification and adjustment to the system. If the plug/s to the electronic controller is/are removed, power is 
disconnected or if the speed signal and/or wire is disconnected  the vehicle shall automatically default to a limp 
mode and shall not be able to be driven in excess of forty kilometres  per hour (40 km/h). In the event of any 
form of malfunction an alert signal shall be generated and transmitted in the prescribed manner  by the 
Authority.  
4.1.4  The speed limiter shall be set in such a way that it shall be hard to tamper with (adjust speed) and 
easy to detect tampering. The inviolability shall be demonstrated to the Authority and testing agencies with 
documentation analysi ng the failure mode in which the system will be globally examined. The analysis shall 
show, taking into account the different states taken by the system, the consequences of a modification of the 
input or output states on the functioning, the possibilities  of obtaining these modifications by failures or by 
tampering and possibility of their occurrence. The analysis level will be always to the first failure.  
4.1.5  The speed limiter shall monitor the road speed of the vehicle by the installation of an 
electro mechanical speed sensor installed onto the speedometer cable take off at the gearbox or by use of the 
vehicle inbuilt speed sensor  
4.1.6  All cable or harness connectors in the speedometer circuit shall be wired and sealed for certification 
purposes. All co nnections shall be soldered and insulated with a flame proof insulation tape of adequate 
length of such a colour as to blend well with the rest of the vehicle wiring.  
4.1.7  The speed limiter shall pre -warn the driver, by way of a high frequency buzzer, tha t the set speed is 
being reached. This warning shall occur at 5 % prior to the set speed and shall continue buzzing once the set 
speed is achieved/exceeded.  
4.1.8  When the set speed is reached, the speed limiter shall temporarily cause the engine to lose p ower. 
Engine power shall be reinstated at a speed not less than the pre -warning switch point, which is 5 % below 
the set speed.  
4.1.9  No vehicle that is covered by the road speed limit legislation may proceed on a public road without an 
approved road speed  limiter device being installed and calibrated and sealed and in possession of an 
authorized certificate of compliance or with the device interfered with or with the device in an inoperative 
condition.  
4.1.10  All road speed limiter systems shall be checked  for accuracy and functionality, at least once per year, 
at the time of the motor vehicle inspection and a certificate issued to that effect (see 4.1.11).  
4.1.11  A duly signed original certificate in indelible ink containing the information as detailed in Annex A shall 
be clearly displayed in an easily accessible position on the vehicle.   
4 © UNBS 2020  – All rights reserved  
 4.2 Requirements for speed limiters  
4.2.1  Workmanship  
The speed limiter shall be visually examined for workmanship, finish, marking and general requirements 
mentioned in 4. 1. 
4.2.2  No effect on the normal operation of vehicle  
4.2.2.1  The speed limiter shall allow normal acceleration and full engine power up to the set maximum 
speed limit when the limitation function comes to play.  
4.2.2.2  The speed limiter shall not interfer e with the brake system of the vehicle.  
4.2.2.3  The speed limitation function shall be performed progressively in such a manner that excessive 
juddering or discomfort is not caused.  
4.2.2.4  The speed limitation function shall not cause engine back firing.  
4.2.2.5  The speed limiter shall not cause uncontrolled engine power  
4.2.2.6  No malfunction or  tampering shall result in increase in engine power above that demanded by 
the position of the driver’s accelerator  
4.2.2.7  The speed limitation function shall be  obtained once the vehicle speed reaches the set maximum 
speed (Vset) regardless of the acceleration a driver may apply  
4.2.2.8  The speed limitation function shall be independent of the condition or soundness of the 
speedometer.  
4.2.2.9  Compliance with the  requirements of 4.2.2.1 to 4.2.2.9 shall be tested in accordance with DUS 
2277 -2. 
4.2.3  Compatibility with environmental conditions  
4.2.3.1  The speed limiter shall be so designed, constructed and assembled so as to resist vibrations, 
corrosion, dust, humi dity, petrochemicals and aging phenomena to which it may be exposed. Compliance 
shall be tested in accordance with DUS 2277 -2.  
4.2.3.2  The speed limiter shall operate satisfactorily without unacceptable electromagnetic disturbance 
from any other device in  its environment. Compliance shall be tested in accordance with DUS 2277 -2 
4.2.3.3  The speed limiter shall be resistant to reverse polarity connections. Compliance shall be tested in 
accordance with DUS 2277 -2.  
4.2.4  Susceptibility to tampering  
4.2.4.1  The limitation threshold shall not, in any case be capable of being increased or removed 
temporarily on vehicles where the speed limitation device has been fitted.  
4.2.4.2  The speed limitation function, the road speed limiter and the connections necessary fo r its 
operation shall be capable of being protected from any unauthorized adjustments or the interruptions of its 
energy supply by the attachment of sealing devices and/or the need to use special tools. All components 
necessary for the full function of the  limiter shall be energized whenever the vehicle is being driven.  
4.2.4.3  The road speed limiter shall be designed and constructed in such a way that it can be fitted in a 
place not easily accessible to unauthorized people.  DUS 2277 -1: 2020  
© UNBS 2020  – All rights reserved  5 
 4.2.4.4  Compliance shall be chec ked by visual examination  
4.2.5  Manuals  
It is required that the road speed limiter has two manuals, namely a vehicle owner’s manual and a 
Technician’s manual, written in English.  
4.2.5.1  Vehicle owner’s manual  
The following information shall be included in  the vehicle owner’s manual;  
a) The expected behaviour of a vehicle where a road speed limiter has been fitted;  
b) Driving tips for a vehicle where road speed limiter has been installed;  
c) What should not be done to the installed road speed limiters;  
d) W hat should be done in case of malfunction; and  
e) The liability of the owner or driver of vehicle for tampering with the road speed limiters.  
4.2.5.2  Technician’s manual  
The following information shall be included in the technician’s manual;  
a) Principles  of operation covering details of how the road speed limiter works;  
b) Fitting Instructions;  
c) Calibration or programming instructions;  
d) Inspection and functionality checks;  
e) Maintenance and troubleshooting instructions  
f) Parts list;  
g) Manufacturer’ s name and authorized trade mark; and  
h) model  
4.3 Requirements for the speed recording, storing and transmitting device (recorder)  
4.3.1  General  
4.3.1.1  The recorder shall incorporate a combination of an on-board  and off -board mechanism for 
recording an d storing the speed of the vehicle  
4.3.1.2  The speed shall be recorded in Km/h at not more than five seconds interval  
4.3.1.3  The retrieved data shall clearly and in an unambiguous manner display the date (dd/mm/ yyyy) of 
recording.  
4.3.1.4  Each entry shall  be time related (either 24 hour or 12 hour format).  
4.3.1.5  Each entry shall capture global position coordinates.   
6 © UNBS 2020  – All rights reserved  
 4.3.1.6  The format and minimum information of the data to be recorded and transmitted shall be as 
prescribed in Annex B and as amended from t ime to time by the Authority.  
4.3.1.7  The recorded data shall be in the same format for both the on board and off board storage 
systems.  
4.3.2  On board data storage  
4.3.2.1  The data shall be stored on board in a non -erasable memory. If the power supply is  disconnected, 
information in electronic format stored in the recorder for a period of 72 driving hours prior to the disconnection 
shall remain retrievable.  
4.3.2.2  An authorized officer and/or a testing officer authorized by the testing agency shall be a ble to print 
data for the last one hour or violations direct from the on board recording device at an inspection point using a 
portable printer by use of a panel mounted type A USB Port.  
4.3.2.3  The officer shall also be capable of viewing the data by a c omputer by use of a panel mounted 
Type A USB port.  
4.3.2.4  The panel mounted USB port shall be placed in an easily accessible point on the dashboard.  
4.3.2.5  The computer shall communicate to the recording device by use of USB CDC protocol 
(communication d evice class) or its equivalent using commands for accessing data as prescribed in appendix 
B. 
4.3.2.6  The printer shall conform to serial communication protocols, and shall communicate by use of the 
traditional serial communication protocol (RS232 protocol ). The portable printer shall comply with thermal 
printer ESC/POS protocol standard commands or its equivalent  
4.3.2.7  The retrieved data shall conform to the format prescribed in Annex B and as amended from time 
to time by the Authority.  
4.3.2.8  The Spe ed limiter supplier shall configure their system to be able to print out speed violations 
only. In case where only speed violations are to be printed, the output shall be in the format prescribed in 
Annex B  
4.3.2.9  The officer shall not require the servic es of a speed limiter specialist to interpret the retrieved 
data.  
4.3.2.10  The speed recorder shall only be activated once the details of the vehicle, vehicle owner and the 
details of the speed limiter are captured for certification purposes.  
4.3.2.11  The system shall function normally when connected to a power supply in the range (12/24V) d.c.  
4.3.2.12.   The data stored shall remain retrievable on -board shall remain retrievable for a period of not 
more than 7days (168 hours)  
4.3.3  off board data storage  
All speed limiter systems shall have an off -board data storage and/or transmission mechanism complying with 
the following requirements:  
4.3.3.1  The system shall, in real time, electronically relay speed data to the speed limiter’s data storage 
system.  
4.3.3.2 The system shall, in real time, electronically relay speed data to a data storage system as 
required by the Authority.  DUS 2277 -1: 2020  
© UNBS 2020  – All rights reserved  7 
 4.3.3.3  All detected violations shall, in real time, be transmitted to the limiter supplier and the Authority’s 
storage system and sh all trigger an alarm to both the supplier and the authority.  
4.3.3.4  If for any reason there is loss of power to the system, the system shall automatically trigger an 
alarm to both the supplier and the authority.  
4.3.3.5  Any loss of signal from the system  to the data storage systems (supplier and the Authority) lasting 
for more than 5 min (300 s) shall automatically trigger an alarm at both the supplier and the Authority  
4.3.3.6  The data stored off board shall remain retrievable for a minimum of six months . 
4.4 Conditions for authorised suppliers of speed limiters  
For the purpose of giving full effect to the act, and all other applicable regulations, the following conditions 
shall be adhered toby all authorised suppliers of speed limiters.  
4.4.1  Manufacture rs authorization  
4.4.1.1  No person shall be authorized to be a limiter supplier for any type of speed limiter without the 
manufacturer’s authorization.  
4.4.1.2  A limiter supplier shall have a specific manufacturer’s authorization for dealing in a particul ar type 
of road speed limiter in Uganda.  
4.4.1.3  Compliance shall be by proof of a certified copy of the manufacturer’s authorization certificate.  
4.4.2  Manufacturers’ warranty   
4.4.2.1  The road speed limiter shall have a manufacturer’s warranty covering a period of not less than 12 
months and this shall be properly documented on a warranty card issued to the vehicle owner where the road 
speed limiter is installed.  
4.4.2.2  Compliance shall be by presentation of a warranty card to the approving authorities that at the 
minimum meets the requirements of 4.4.12.  
4.4.3  Establishment of fitting centers and appointing of agents  
4.4.3.1  The authorized speed limiter supplier shall open fitting centers and appoint agents in accordance 
with the existing legal and sta tutory requirements.  
4.4.3.2  A fitting centre facility shall meet all the requirements specified cified in Annex C.  
4.4.4  Change in design or construction of the approved type of speed limiter  
A Limiter supplier shall seek fresh approval when a speed limi ter for which approval was given changes in 
design, operation or construction.  
4.4.5  Training of government technical personnel  
The limiter supplier who introduces a type of speed limiter for approval shall train officers from the applicable 
regulatory/te sting agencies in the fitting and inspection of the presented speed limiter once approved.  
4.4.6  Records  
4.4.6.1  The speed limiter supplier shall keep records of all vehicles fitted with the speed limiters. A 
master register, kept in a central place, shal l have all the information for fittings at all branches and appointed 
agents/fitting centers.   
8 © UNBS 2020  – All rights reserved  
 4.4.6.2  The speed limiter supplier shall forward the compiled data to the Authority in such a manner as 
shall be prescribed by the Authority. The same data shall be made available to any other agency(ies) on 
demand.  
4.4.6.3  The speed limiter supplier shall keep the records for inspection by the Authority/agency(ies) for a 
period governed by the applicable legislation/regulation.  
4.4.7  Fitting certificates  
Every v ehicle fitted with a speed limiter shall be issued with a certificate of compliance (see Annex D) signed 
by a person approved by the speed limiter supplier. The sample compliance certificate with the specimen 
signature of the supplier shall be forwarded to  the Authority as required by the applicable 
legislation/regulation.  
4.4.8  Record of technicians  
4.4.8.1  The speed limiter supplier shall approve and keep a record of all the technicians who fit the speed 
limiter  
4.4.8.2  The training of personnel approved  to fit speed limiters shall be, as a minimum, as prescribed in 
US 735:2008  together with any approved modifications for speed limiter fitters.  
4.4.9  Calibration equipment  
4.4.9.1  All unique calibration and sealing devices shall remain the property of th e speed limiter supplier.  
4.4.9.2  The speed limiter supplier shall retrieve all sealing and calibration equipment once a branch is 
closed or fitting agency is withdrawn.  
4.4.9.3  The speed limiter supplier shall limit the possession of calibration equipment  or devices to 
authorized personnel.  
4.4.10  The suitability of the speed limiter for a particular type of vehicle.  
The responsible authority shall approve and gazette the types of speed limiters to be used in different 
categories of vehicles in Uganda.  Ho wever, the responsibility to determine the suitability of speed limiter for a 
particular type of vehicle shall be vested on the speed limiter supplier and or his approved agent.  
4.4.11  Warranty obligations  
The speed limiter supplier shall take responsibil ity for the warranty obligations for the speed limiter supplied.  
4.4.12  Start of operations  
4.4.12.1  A speed limiter supplier shall train relevant officers from the Authority and testing agencies in the 
fitting and detecting of tampering before being allo wed to start operation. Records of such training shall be 
made available at the time of applying for approval.  
4.4.12.2  A speed limiter supplier shall provide the following each to (both)  the authority and testing 
agencies before being allowed to start ope ration:  
a) Submit one sample of the speed limiter for light and heavy commercial each (in case where the Limiter 
Supplier intends to fit both light and heavy commercial vehicles).  
b) Submit one sample of the calibration device for each of the speed limiter s. 
c) Submit two samples of certificate of fitting.  DUS 2277 -1: 2020  
© UNBS 2020  – All rights reserved  9 
 d) Submit a list of physical addresses for all speed limiter -fitting centers under limiter supplier’s control.  
e) Submit two (2) copies of the technical manuals.  
f) Submit two of the sample warranty cert ificates.  
g) Submit two copies of the user manuals.  
h) Submit the physical address of the central office where all records of the fittings at various centers shall be 
kept.  
4.4.12.3  The speed limiter supplier shall update the agencies in 4.4.12.2 on any n ew fitting centers under 
their control and the responsible signatories to the fitting certificates at those centers  
4.4.12.4  Before starting operations, the speed limiter supplier shall sign a commitment binding them to the 
terms and conditions for supplie rs of speed limiters for the effective implementation of the Speed Limiter 
Regulations as shall be prescribed by the Authority from time to time.  
4.4.13  Poor field performance  
In case of poor field performance, the approval of any of the approved speed li miters shall be revoked by the 
Authority in consultation with other approving/testing agencies/authorities once violation of quality 
performance and lack of full compliance to other contractual obligations is established   
10 © UNBS 2020  – All rights reserved  
 Annex  A 
(normative)  
 
Sample display  certificate  
Certificate No : 
Name of Speed Limiter Supplier:  
Address:  
Telephone contact:  
Speed limiter Compliance  
Date of installation  ..............................................  
Vehicle registration  ..............................................  
Chassi s no ..............................................  
Type of speed limiter  ..............................................  
EXPIRY DATE  ..............................................  DUS 2277 -1: 2020  
© UNBS 2020  – All rights reserved  11 
 Annex  B 
(informative)  
 
Minimum recorded/transmitted data and data format  
B.1 Data header  
B.1.1 Each device header shall have data containing information specific to the particular device which shall 
be none -erasable once programmed into the device. This information shall be progra mmed first before the 
device can allow any other features of the speed -recording  device to be initialized.   
B.1.2 Below the mandatory information to be captured in the device header:  
 a) Registered Vehicle Owner.............  
d) VEHICLE REG. NUMBER...... .......   
e) CHASIS NO.......................   
f) VEHICLE MAKE & TYPE.............   
g) Fitting CERTIFICATE NUMBER..............   
h) LIMITER TYPE...................   
i) LIMITER SERIAL.................   
j) DATE OF FITTING.................   
k) FITTING A GENTS NAME.............   
m) Physical address of fitting  STATION......   
o) AGENT PHONE NUMBER..............   
B.2 Reports to be recorded/transmitted   
B.2.1 Speed records  
The speed records specified in 4.3.2 and 4.3.3 shall be continuously updated as re quired by this standard or 
as prescribed by the Authority   
B.2.2 Data presentation format   
Both onboard and off board data records shall at a minimum have the following information presented in the 
format below in addition to the mandatory header describ ed in B.1.2.  
DATE  TIME  SPD LONG  LATT  
22/11/2017  20:19:25  000.0  3.0674° S  37.3556° E  
  
12 © UNBS 2020  – All rights reserved  
 B.2.3 Speed violations print out  
Where it is required to print out speed related violations, the printout shall have the following minimum 
information in addition to th e mandatory header (see B.1.2)  
DATE  TIME  SPD 
22/11/2017  20:19:25  86.0 
B.3 Commands  
B.3.1 These are ASCI characters sent from a host to a device and may have a length of one byte or more.  
B.3.2 All speed recording devices approved for use in Uganda sha ll have common protocols and commands 
sent shall be in human readable non encrypted text.  
B.3.3 The following commands shall apply  
FUNCTION  COMMAND  EXPECTED OUT PUT  
Header files  Head  Header files as in B.1.2 shall be displayed on 
to the screen  
Reset dev ice RST The recording device is reset  
Read trip data  TRP All speeds stored in the device for the last 72 
HOURS shall be displayed on to the screen  
Highest speed 
attained  TP Top speed recorded in the device for the last 
6hrs shall be displayed on to the s creen.  
Read trip data 
for one hour  1TP All speeds stored in the device for the last 
ONE HOUR shall be displayed on to the 
screen  
Read trip data 
for three  hour 3TP All speeds stored in the device for the last 
THREE HOUR S shall be displayed on to the 
scree n 
Read trip data 
for six hours  6TP All speeds stored in the device for the last 
SIX HOURS shall be displayed on to the 
scree n 
Violations  VIOL  Violations recorded in the device shall be 
displayed on the screen.  DUS 2277 -1: 2020  
© UNBS 2020  – All rights reserved  13 
 Annex  C 
(informative)  
 
REQUIREMENTS FOR SPEED LIMITER FITTING CENTRE S 
REQUIREMENT  Remark  
  
1 Ownership Particulars    
 Company Name  :    
 Physical Address:    
 Contact :    
 2 Premises    
  Client waiting facilities    
 Well maintained, clean and tidy   
  Demarcated customer parking and signage    
  Staff Wash rooms clean and Adquate    
  Visitor’s Washrooms  clean  and well labeled    
 signage ’s to indicate facilities and customer restrictions  (such as no smoking 
sign)  
 3 Safety and Enviro nmental requirements    
  Adequate fire extinguishers  at least two (02)    
 First Aid   (easy accessible )   
  Demarcation of fire  extinguishers    
  Clean  and clear demarcation of emergency exists    
  Waste disposals    
 Safety working gear for all te chnical staff   
 4 Fitting area general  requirements     
14 © UNBS 2020  – All rights reserved  
 REQUIREMENT  Remark  
  Fitting area to be capable of accommodating a minimum of 10 vehicles  
  Floor  to be in good condition , clean and oil free   
 Appropriate fitting/installation equipment   
  Signage - Sufficient s ignage to indicate facilities and customer /commercial 
restrictions    
   Adequate lighting with all electrical lighting appliances in good working 
condition    
  Fitting area to be well ventilated    
  Part or all of the fitting area to be well roofed and  secured from external 
weather.    
  Designated part storage  area (parts not be stored in cars)    
5 Personnel Requirements    
  Manager    
  assistants/supervisor    
  Adequate certified technicians    
6 Record keeping   
 Means of capturing records of vehicles fitted with speed limiters   
 Up-to-date records of vehicles fitted with speed limiters   DUS 2277 -1: 2020  
© UNBS 2020  – All rights reserved  15 
 Annex  D 
(informative)  
 
Sample certificate of complianc e 
Name of Limiter Supplier  
Address and physical loca tion   
CERT No…………….  
SPEED LIMITER COMPLIANCE CERTIFICATE  
THIS IS TO CERTIFY THAT:  
Vehicle Reg; No………………………………………………………Chassis No……………………...  
Make…………………………………………………………                    Type…………………………….  
Has been fitted with approved speed LIMITER of type… ………………………………………………….  
Serial No…………………………………………………………………..Dated……………………………  
This certificate is valid for 12 months from the date of issuing.  It is an offence to tamper with the speed 
LIMITER and it will nullify all warranty.  
Signed with stamp by Supplier/D ealer/Agent  
FITTING CENTER DETAILS  
Business Reg. No…………………………… Pin no……………………… VAT no………………….  
Company Address……………………………  
Date of installation/ inspection ……………………..Certified by ………………….  
Sign………………………………………………….  
Expiry Date……………………………………  
This Certificate is  issued without any alteration whatsoever.   
16 © UNBS 2020  – All rights reserved  
 Bibliography  
[1] ISO ##### -#, General title — Part #: Title of part  
[2] ISO ##### -##:20##, General title — Part ##: Title of part  
 DUS 2277 -1: 2020  
© UNB S 2020  – All rights reserved  17 
 Certification marking  
Products that conform to Uganda standards may be marked w ith Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under t he certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
require ments of that standard under a system of supervision, control and testing in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 DUS 2277 -1: 2020    
 
ICS nn.nnn.nn  
Price based on nn pages  
© UNBS 2020 – All rights reserved