Driverless Car Gets Stuck in Wet Concrete in San Francisco

Driverless vehicles promise a future with less congestion and pollution, fewer accidents resulting from human error and better mobility for people with disabilities, supporters say.

But every now and then, one of the cars runs into trouble in a way that casts a bit of doubt on that bold vision.

So it was on Tuesday in San Francisco, where a driverless car somehow drove into a city paving project and got stuck in wet concrete.

Paul Harvey, 74, a…