RLJ (Red Light Jumping)

An RLJ has occurred when a vehicle has crossed the stop line while the associated traffic light signal was red.

It's common folk wisdom in the UK that "cyclists always jump red lights", although research shows that people aren't entirely law abiding in this respect when they're behind the wheel of a car either.

On the UK's roads, which have been designed for motor vehicles, red light jumping by people on bikes tends to mainly be an "early start" manoeuvre, where the cyclist sets off shortly before the lights change to green in order to be clear of any turning motor vehicles.

Conversely, red light jumping by people in cars tends to be of the "amber gambler" variety - i.e. speeding through shortly after the lights have turned red rather than stopping.