Transportation Sustainability Research Center

Uber and Lyft already compete in ride-hailing, ride-sharing, bike-sharing and e-scooters. Next year, they'll be competing for investors, too: Both companies are reportedly planning initial public offerings for early 2019.

Anyone who owns a car in San Francisco knows the agony of giving up a good parking spot. Every day, the nearly half a million cars registered in the city vie for about 280,000 street parking spaces.