It's not about how well the cruise control drives it's about how predictably it drives.
Oh, if that was the criteria, insurance companies would never cover them. Damn things think trucks turning left on an expressway is a billboard and attempt to drive under.
Cars can function if you have shitloads of road, there's no reason why car-sized vehicles can't work if you make the track a lot cheaper. The Vegas loop doesn't work because it uses shitty cars on tires on roads in tunnels. Morgantown PRT has too-expensive track requirements that you can't conveniently mix with other forms of transport.
Cars don't work because you need shitloads of road if you want them to work in the city. They don't scale. This same problem is why PRT and the loop fail. You need roughly human size vehicles for individual humans, or enough room for everyone. Car size vehicles are farm equipment for rural life.
Nothing recedes like success. -- Walter Winchell