He's touched on some reasons, but definitely not all of them. A big part of traffic is that communication doesn't happen - because it can't. I can't tell the

He's touched on some reasons, but definitely not all of them. A big part of traffic is that communication doesn't happen - because it can't. I can't tell the driver behind me "I'm going to be slowing down in 10 seconds, get ready." Likewise, it isn't easy to convey to someone merging onto a freeway that I'm going to let them in ahead of me so we both end up slowing down so that we're both still in contention with each other until someone takes the initiative. Now, if only we had some way that cars could communicate with each other and the road so that they could regulate speed and allow operations such as merging as efficiently as possible. . .