[maxsilver]

> Traffic jams are almost ALWAYS caused by human error at some point in the chain.

Sometimes, sure. But there are a lot of key areas where urban roads / freeways are simply past usable capacity (even with smarter self-driving cars communicating together).

Most major cities have experienced significant population growth in the last 10 years, and have also built little-to-no new freeways or additional car capacity in the last 10 years. If I had to guess at the future, I would predict both of those trends to continue.