RLJ (Red Light Jumping). (The definitive bikeradar thread)

Amber means stop. Unless you are too close to the lights to stop safely.

(e)the amber signal shall, when shown alone, convey the same prohibition as the red signal, except that, as respects any vehicle which is so close to the stop line that it cannot safely be stopped without proceeding beyond the stop line, it shall convey the same indication as the green signal or green arrow signal which was shown immediately before it;