Pre 1906 vehicles
Vehicles certified by the London Science Museum as being designed
before 1 January 1905 and constructed before 31 December 1905 can
have a gong, bell or siren audible warning.
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1. Operate the horn control and note the volume and character
of the sound
emitted.
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a. the horn control missing, insecure or not readily accessible
to the driver
Note: Inform the driver if the horn is insecure
b. the horn does not function
c. the sound emitted by the horn is not loud enough to be heard
by another road user
d. a gong, bell, siren or two or more tone horn fitted
Note: When operated, a two or more tone horn automatically produces
a sound which alternates at regular intervals between fixed notes
A vehicle is allowed to be fitted with a bell, gong or siren, but
not two-tone only as part of an anti-theft device
e. for a vehicle first used on or after 1 August 1973, a sound emitted
by the horn is
. not a constant note
. not continuous or uniform
. harsh or grating.
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