Rear Under-Run
Introduction
Regulation 49 of the Construction and Use Regulations (1986) specifics Rear Under-Run Protection, with Regulation 50 concluding
the maintenance of the same.
Regulation No 58 of the Economic Commission for Europe of the United Nations (UN/ECE) - Uniform provisions concerning the approval of:
- Rear Underrun Protection Devices (RUPDs)
- Vehicles with regard to the Installation of an RUPD of an approved type
- Vehicles with regard to their Rear Underrun Protection (RUP).
Requirement and Fitting
Rear under-run bar is to be fitted as close to the rear as practicable and must not be further forwards than 400 millimetres from the
rear of the vehicle. The maximum width (without rear sideguards) is to be no more than the outermost edge of the outermost tyre, with the
minimum width of 100 millimetres.
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A rear under-run protection device is required to be fitted on:
- a motor vehicle with a maximum gross weight which exceeds 3500 kg and which was first used on or after 1st April 1984; or
- a trailer manufactured on or after 1st May 1983 with an unladen weight which exceeds 1020 kg.
This regulation does not apply to:
- a motor vehicle which has a maximum speed not exceeding 15 mph;
- a motor car or a heavy motor car constructed or adapted to form part of an articulated vehicle;
- an agricultural trailer;
- engineering plant;
- a fire engine;
- an agricultural motor vehicle;
- a vehicle fitted at the rear with apparatus specially designed for spreading material on a road;
- a vehicle so constructed that it can be unloaded by part of the vehicle being tipped rearwards;
- a vehicle owned by the Secretary of State for Defence and used for naval, military or air force purposes;
- a vehicle to which no bodywork has been fitted and which is being driven or towed:
(i) for the purpose of a quality or safety check by its manufacturer or a dealer in, or distributor of, such vehicles; or
(ii) to a place where, by previous arrangement, bodywork is to be fitted or work preparatory to the fitting of bodywork is to be carried out; or
(iii) by previous arrangement to premises of a dealer in, or distributor of, such vehicles;
- a vehicle which is being driven or towed to a place where by previous arrangement a device is to be fitted so that it complies with this regulation;
- a vehicle specially designed and constructed, and not merely adapted, to carry other vehicles loaded onto it from the rear;
- a trailer specially designed and constructed, and not merely adapted, to carry round timber, beams or girders, being items of exceptional length;
- a vehicle fitted with a tail lift so constructed that the lift platform forms part of the floor of the vehicle and this part has a length of at least 1 metre measured parallel to the longitudinal axis of the vehicle;
- a trailer having a base or centre in a country outside Great Britain from which it normally starts its journeys, provided that a period of not more than 12 months has elapsed since the vehicle was last brought into Great Britain;
- a vehicle specially designed, and not merely adapted, for the carriage and mixing of liquid concrete;
- a vehicle designed and used solely for the delivery of coal by means of a special conveyor which is carried on the vehicle and when in use is fitted to the rear of the vehicle so as to render its being equipped with a rear under-run protective device impracticable; or
- an agricultural trailed appliance.
EU Requirements
Where rear under-run protection is required, it must generally satisfy the specification in EU Directive 221/1970, as amended by EU
Directive 490/1979. The specifications within the directive are lengthy and concern vehicle manufacturers. However, where operators are
concerned, note should be taken regarding serious problems that may arise if the vehicles operated have:
Tail lifts
In the case of vehicles fitted with a tail lift, bodywork or other part that makes it impracticable to fit a rear under-run protective
device satisfying the specification, it is permissible to fit one or more devices which do not protrude beyond the overall width of the
vehicle (excluding any part of the device or devices).
The specification here is that if more than one device is fitted, the gap between the devices must not exceed 50 centimetres, and also
the gap from the outermost device to the outermost edge of the vehicle should not exceed 30 centimetres.
Demountable bodies
In the case of demountable body outfits, the regulations amend some of the measurements, so that fitting a rear under-run device to
a vehicle does not interfere with the operation of the demountable body equipment.
Trailers
Where a trailer with a single axle or two close-coupled axles, the height of 550 millimetres referred to as the height from the
underside of the device to the ground (see graphic at top of page) is measured when the coupling of the trailer to the vehicle by which
it is drawn is at the height recommended by the manufacturer of the trailer.
Maintenance of the Device
Every device fitted to a vehicle in compliance with the requirements of regulation 49 shall at all times when the vehicle is on a road be
maintained free from any obvious defect which would be likely to affect adversely the performance of the device in the function of giving
resistance in the event of an impact from the rear.
