Amber Gambler Meaning

(Britain, idiomatic) A driver of a road vehicle who accelerates when the traffic lights change from green to amber (instead of stopping, as required by law), gambling 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.

Example: 2007 Dec. 24, "Drivers warned over the ‘Seven Deadly Sins’," Bolton News (UK) (retrieved 29 Aug. 2011):
  The sins the foundation has identified include eating at the wheel, becoming a traffic-light hopping "amber gambler" and drinking and driving.