For mobile enforcement, co-located camera and speed limit reminder signs
should continue to be placed in advance of the point of entry to the site or route
(including or excluding side roads at the discretion of the road safety partnership)
in the direction being enforced. Camera signs should also continue to be placed
thereafter at intervals of around 1 km throughout the length being enforced
Depending upon the enforcement method used, speed camera housings (including
tripod-mounted cameras) or the camera operator or the mobile enforcement vehicle
should be clearly visible from the driver’s viewpoint at the following minimum visibility
Vehicles from which enforcement may take place should be liveried and clearly
identifiable as an enforcement vehicle. Visibility of the livery should be maintained
during enforcement, e.g. where it is necessary for the doors to be open, markings or
livery should be apparent to approaching traffic in the direction of enforcement.
And then the get out clause
This camera signing, visibility and conspicuity guidance has no bearing on the
enforcement of offences. Non-compliance with this guidance does not provide any
mitigation of, or defence for, an alleged offence committed under current UK law.