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Guide To: ECE R28 - Audible warning devices

23 July 2023

UN ECE R28, or Regulation No. 28 of the Economic Commission for Europe of the United Nations, is a regulation that specifies the requirements for audible warning devices for power-driven vehicles and their trailers. These devices are used to warn other road users of the presence of a vehicle, such as when the vehicle is reversing or approaching a blind bend.

UN ECE R28 applies to audible warning devices that are either stand-alone or built into other light units, such as combination or multi-function lights. The regulation specifies the sound level, frequency, and duration of audible warning devices. It also specifies the test methods that must be used to verify that audible warning devices meet the requirements of the regulation.

UN ECE R28 is recognized by many countries around the world. This means that audible warning devices that have been approved under UN ECE R28 can be used on vehicles in these countries.

Here are some of the key requirements of UN ECE R28:

Audible warning devices must have a sound level of at least 90 dB(A) at a distance of 1 m. Audible warning devices must have a frequency of between 1,700 and 3,500 Hz. Audible warning devices must have a duration of at least 2 seconds. UN ECE R28 is an important regulation that helps to improve the safety of vehicles on the road. By requiring audible warning devices to meet certain standards, the regulation helps to ensure that these devices are effective in warning other road users of the presence of a vehicle.

Here are some additional points about UN ECE R28:

Audible warning devices must be used in conjunction with visual warning devices, such as hazard lights or reversing lamps. Audible warning devices must not be used when the vehicle is moving forward. Audible warning devices must not be used in a way that is likely to cause annoyance or disturbance to other road users.

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