"This could be good for congestion if it causes vehicle occupancy rates to go up, but on the other hand, the Uber Pool rides and I guess these Express rides are really, really cheap, just a couple of dollars, so they're almost certainly going to be pulling people away from public transport options," Wilson said. "Why get on a bus with 50 people when you can get into a car and maybe if you're lucky, you'll be the only person in it?"