Guide To: ECE Regulation 91

UN ECE R91, or Regulation No. 91 of the Economic Commission for Europe of the United Nations, is a regulation that specifies the requirements for the installation and performance of side marker lamps for power-driven vehicles and their trailers. These devices are used to improve visibility of vehicles at night and in poor weather conditions.

UN ECE R91 applies to side marker lamps that are either stand-alone or built into other light units, such as combination or multi-function lights. The regulation specifies the size, shape, color, and photometric performance of side marker lamps. It also specifies the test methods that must be used to verify that side marker lamps meet the requirements of the regulation.

UN ECE R91 is recognized by many countries around the world. This means that side marker lamps that have been approved under UN ECE R91 can be used on vehicles in these countries.

Here are some of the key requirements of UN ECE R91:

Side marker lamps must be amber or white in color. Side marker lamps must have a minimum photometric performance. Side marker lamps must be mounted at a height of at least 350 mm and not more than 1,200 mm above the road surface. Side marker lamps must be mounted at a distance of at least 400 mm from the side of the vehicle. UN ECE R91 is an important regulation that helps to improve the safety of vehicles on the road. By requiring side marker lamps to meet certain standards, the regulation helps to ensure that these devices are effective in improving visibility of vehicles at night and in poor weather conditions.

Here are some additional points about UN ECE R91:

Side marker lamps must be marked with the UN ECE R91 approval number. Side marker lamps must be installed in a way that ensures that they are visible to other road users. Side marker lamps must be switched on automatically when the vehicle is moving.