Jun 23, 2006 · emiffy. Well-Known Member. Jun 26, 2006. #8. Jun 26, 2006. #8. Re: Amber traffic light. I think the amber traffic light duration is also a function of the posted speed limit of the road, e.g., if the road speed limit is 70km/h, then the stopping duration is longer, hence the amber traffic light duration should be longer, as compared to a 50km/h