They tend to be used on smart motorways when the speed limit is lowered to ease congestion or in the event of poor weather or some other hazard. "The speed cameras are situated on the overhead ...

They are linked to video cameras which monitor the Advanced Motorway Indicator (AMI) displays mounted on the overhead gantries. The system can read what speed limit is being displayed and adjust the ...

Though they’re designed to make driving a safer, quicker and more enjoyable affair, smart motorways have become ... Dictated by overhead dot matrix signs, the system is designed to control ...

National Highways said it was now looking at the cameras being fixed to overhead gantries on motorways. The police forces taking part in the National Highways trial are Durham, Greater Manchester ...

Variable speed limits, controlled by speed cameras, manage traffic flow when there is congestion, or if there is a hazard ahead. On dynamic motorways, the overhead gantries also tell drivers ...