If it does try to start my car on a green, who's to say I pulled my car out of gear. My car won't start, and I'll be holding up traffic until I DO start my car because I left it in gear.
What if someone's sh!tbox doesn't start. What if a car is disabled at a light? They can't even try to start it at a red.
I think there are far too many scenarios to figure out it will only take that one time someone dies to call the whole system a heretic.