An autonomous vehicle is parked for its test drive in Singapore Wednesday, Aug. 24, 2016. The world’s first self-driving taxis, operated by nuTonomy, an autonomous vehicle software startup, will be picking up passengers in Singapore starting Thursday, Aug. 25. The service will start small – six cars now, growing to a dozen by the end of the year. The ultimate goal, say nuTonomy officials, is to have a fully self-driving taxi fleet in Singapore by 2018, which will help sharply cut the number of cars on Singapore’s congested roads. (AP Photo/Yong Teck Lim)

An autonomous vehicle is parked for its test drive in Singapore Wednesday, Aug. 24, 2016. The world’s first self-driving taxis, operated by nuTonomy, an autonomous vehicle software startup, will be picking up passengers in Singapore starting Thursday, Aug. 25. The service will start small – six cars now, growing to a dozen by the end of the year. The ultimate goal, say nuTonomy officials, is to have a fully self-driving taxi fleet in Singapore by 2018, which will help sharply cut the number of cars on Singapore’s congested roads. (AP Photo/Yong Teck Lim)