One Light Two Light Green Light Blue Light

It's come to my attention over the past few years that cars are missing something very important to a polite driving environment. There's a serious lack of communication among drivers. I'm a very cautious driver, but when I make small driving mistakes, I wish I could apologize for them. I feel bad that there's no way to let other drivers know that I acknowledge that I've made a mistake, and I wasn't trying to be rude. Most of the time, I notice this lack of communication not when I want to apologize, but when I want to thank someone, maybe for letting me into the lane or for letting me go first at a stop sign. Instead, I sit there wildly waving my hand to try to thank them, but I doubt they ever see it, and the gesture goes unnoticed. That's why I think we need to make a few additions to cars' external lights for signaling: a blue light that would flash when the driver wanted to say, "I'm sorry," and a green light for "thank you." These lights would be right next to the turn signals and would be turned on pretty much the same way as turn signals. Think of how much more polite our roads would be and how much misunderstanding could be avoided if our cars were better equipped.