Car MOT Manual 2012 onwards
1.6 Audible Warning Horn
InformationPre 1906 vehicles can have a gong, bell or siren audible warning, provided they were designed before 1 January 1905 and constructed before 31 December 1905.
Method of Inspection1. Check the presence, security and operation of the horn control.
2. Operate the horn and note the volume and character of the sound emitted
Reason for Rejection1. The horn control missing, insecure or not readily accessible to the driver.
Note: Inform the driver if the horn is insecure.
2. The horn:
b. is not loud enough to be heard by another road user
c. is a gong, bell or siren
d. has more than one tone
Note: When operated, a two or more tone horn automatically produces a sound which alternates at regular intervals between fixed notes.
e. fitted to a vehicle first used on or after
1 August 1973, emits a sound which is:
• not a continuous or uniform note
• harsh or grating.