Traffic light safety cameras monitor the junction at which they are located twenty-four hours a day. They operate similarly to Truvelo cameras.

Vehicles that cross the Stop line and enter the junction after the lights have changed to red, break a magnetic field that causes a photograph to be taken of the offence.

It does not record the vehicle speed but does record the make, model and registration details, which are used to trace the owner and issue a Fixed Penalty Notice.