Most of them tend to stay in the same place, but local police forces also utilise mobile speed cameras which can be set up at short notice at accident blackspots where there is a history of road traffic incidents over a three year or more period.
There are also mobile speed cameras used as part of safety camera partnership teams and speed safety campaigns.
They can be used from marked or unmarked police cars, or manually operated by police officers using radar guns and laser guns.
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