Do motorway speed cameras operate when no limit is shown?
I have received a notification of prosecution from West Midlands Police for travelling at 81 mph thus exceeding the 70 mph speed limit. This was recorded by an automatic camera between Junctions 3A & 4 on the M42. I always thought overhead gantry cameras only operated when a speed limit was displayed on the screen. Am I correct?
Asked on 7 April 2025 by chris timothy noltingk
Answered by
David Ross
Smart motorways that have variable speed limits for traffic management purposes usually have permanent speed cameras to enforce the limits which for the most part are always in operation. If a speed limit is not displayed then the national motorway speed limit of 70mph applies.
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