What is "amber gambler"

n. (context UK idiomatic English) A driver of a road vehicle who accelerates when the traffic lights change from green to amber (instead of stopping, as required by law), gamble that no vehicle will cross his or her path; a driver who starts off when the traffic lights show red and amber together, but not yet green.

Amber Gambler is a metaphorical phrase and the title of a British public information film (PIF) from the 1970s, about the dangers of speeding through traffic lights before the amber changes to red "when there is ample time to stop", or in advance of it turning to green.

The Amber Gambler Twins is one of many public interest films trying to change the public's behavior. It tries to induce a reflective moment leading to an "I see" Epiphany.