Cruise, the self-driving subsidiary of General Motors, started offering robotaxi rides this week in San Francisco. Anyone can sign up for the chance to be selected to get a ride in a self-driving car, provided they don’t mind staying up late. Cruise’s robotaxis are generally only operating from 11 p.m. to 5 a.m, according to the company. Access is limited, so people are likely to find themselves idling on Cruise’s wait list. So far Cruise says it’s given more than 500 rides.