# Regulation (EU) No 540/2014 of the European Parliament and of the Council of 16 April 2014 on the sound level of motor vehicles and of replacement silencing systems, and amending Directive 2007/46/EC and repealing Directive 70/157/EEC (Text with EEA relevance), Division II.2: Operation conditions

Extent: E+W+S+N.I.

(a)Sound generation method
The AVAS shall automatically generate a sound in the minimum range of vehicle speed from start up to approximately 20 km/h and during reversing. Where the vehicle is equipped with an internal combustion engine that is in operation within the vehicle speed range defined above, the AVAS shall not generate a sound.
For vehicles having a reversing sound warning device, it is not necessary for the AVAS to generate a sound whilst reversing.
(b)Switch
The AVAS shall be fitted with a switch which is easily accessible by the vehicle driver in order to allow engaging and disengaging. Upon restarting the vehicle, AVAS shall default to the switched on position.
(c)Attenuation
The AVAS sound level may be attenuated during periods of vehicle operation.

---
Source: https://www.legislation.gov.uk/eur/2014/540/annex/VIII/section/II/division/II.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-540/annex-VIII/section-II/division-II.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.