Crashes don't matter very much, since a human vs a machine isn't going to change anything in that regard. Let's assume lack of oil implies mechanical issues (si

Crashes don't matter very much, since a human vs a machine isn't going to change anything in that regard. Let's assume lack of oil implies mechanical issues (since... you know, fill it with oil before it leaves). In that case it's vastly cheaper to dispatch a mechanic when a problem arises then it is to have a fleet of drivers sitting in a vehicle.