Tues 12:12 pm, 45 mph, busy lunchtime traffic & 2-lane left turn into large shopping complex controlled by traffic light. I was 2nd in line for turn, upon green light the car ahead moved forward immediately. I accelerated from a full stop, glanced at light as I started to cross the "stop here" line, saw that the light was already yellow even tho it hadn't been green for 5 seconds. If I had slammed on my brakes I would have been in the intersection, I continued thru the turn & light turned red. The total time elapsed from green to red was less than 10 seconds. Red light cameras are installed at busy dangerous intersections but this light was green only long enough for a single car in each lance to legally execute the turn. Link to online video errors so not available to prove elapsed time.