vehicles that operate without human intevention are inevitable
vehicles : yes - they already exist, e.g. the space shuttle cars : no - it may happen eventually, but the most advanced microprocessors and software are nowhere near doing the job. In the UK there are roadworks everywhere (with very little happening most of the time). Until we have genuine artifical intelligence (i.e. skynet/terminator level intelligence) there is no chance of computers being able to cope.
Maybe, just maybe, current CPU designs will suffice as they become more advanced, but current software designs will never be able to achieve the intelligence levels required.