Mobile CCTV units have been deployed on vans to catch out drivers in areas with high rates of people failing to comply with the new charges.
The van cameras have been located in different areas, such as Heathrow, where one was spotted behind a roadside sign checking vehicles as they come off the M25. "The camera locations will be determined to maximise the effectiveness and efficiency of the scheme, chiefly by locating the mobile ANPR camera vehicles where ANPR cameras are not operationally working or have not been installed," the impact assessment says.
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