car beeps when lights go green

Red lights can be 3-5 minutes long. Your car is sitting stationary in the road in a que of traffic. Without this device, if you're talking to the passenger, you have to keep checking the lights to see if they're green. Sometimes you don't

and get honked

You enable this device, make sure it's pointing at the right lights, and then are notified when they change.

The danger is that the device reads the wrong green light, you don't look, and drive through a red. But that's only if you're the first car ... And, you should check anyway...

ps, the first version of this idea was worded differently and it wound quite a few people up, so i've rephrased it and deleted the comments... I hope nobody minds...