I think demand based pricing is the most efficient tool to deal with traffic. That being said, assuming in 3-5 years cars will be self driven, traffic should be a thing of the distant past. Its already started where people no longer own cars and use Uber and the like...now imagine if over 50% of drivers did that? Picture a giant luxury bus with wi-fi and spacious seats driving all around the city using an Uber pool like service. Prices in theory would be vastly cheaper for the rider as a) there is no driver to pay and b) insurance cost for bus would be cheaper. seems like a win win