If someone decides to go through the intersection even though they can't get all the way through it, and then they get stuck, their light turns red, yours turns green, and they're in front of you, you can just hit the gas. You slam into the side of their car at whatever speed you can muster, then just back up, and whenever they're clear to go they can get out of your way, and then you get to continue, a little delayed by their stupidity.
Their insurance pays for both your cars, and their premiums go up.