An Associated Press reporter taking a ride Wednesday observed that the safety driver had to step on the brakes once, when a car was obstructing the test car's lane and another vehicle, which appeared to be parked, suddenly began moving in the oncoming lane.
So it's not perfect yet, obviously. The good news is that, worldwide, Singapore is generally one of the safer places you could be driving. In 2013, the World Health Organization estimated that the city-state had just 3.6 road traffic fatal injury deaths per 100 000 population. (For comparison, the United States saw 10.6; Brazil, which just hosted the Rio Olympics, saw 23.4.)
Either way, it's an exciting step forward in this new technology, a version of which will be hitting American streets very soon as Uber and Volvo gear up to test their self-driving cabs in Pittsburgh.