My first thought was - yeah, that'll create a lot more speeders! But actually on reflection I think there are a couple of very good side effects to come out of this:
1. The most dangerous time to speed / stop heavily is in or very near an intersection. Giving drivers more warning may actually encourage them to use the actual intersections more safely.
2. Traffic is considerably congested by the stop start nature of intersections. If this helps to more gently control cars passing through in both directions, it may considerably speed up everyone's trips (even those that slow rather than speed - keeping in mind they can then still hit the green light at say 2/3 speed rather than zero.)
1. The most dangerous time to speed / stop heavily is in or very near an intersection. Giving drivers more warning may actually encourage them to use the actual intersections more safely.
2. Traffic is considerably congested by the stop start nature of intersections. If this helps to more gently control cars passing through in both directions, it may considerably speed up everyone's trips (even those that slow rather than speed - keeping in mind they can then still hit the green light at say 2/3 speed rather than zero.)