A driverless car in San Francisco drove right into wet concrete and got stuck after seemingly mistaking it for a regular road: ‘It ain’t got a brain’ / The site had been marked off with constructio…::The site had been marked off with construction cones and workers stood with flags at each end of the block, according to city officials.
Hell, once you go deep into the city, it’s a bunch of edge cases. Old, large cities with weird, complicated intersections and 5-10 signs next to it to explain the rules on how it works. Expansion is messy, and not all roads are perfect grids with stoplights and 4-way traffic.