I really don't see the point. We live in an imperfect world, we will never have 100% accident free roads, just as we don't have 100% accident-free anything. I don't perceive that the current rate of car accidents as justifying huge expenditures on systems with dubious track records for reducing accidents.

On the other hand, more people are killed by bee stings each year world-wide than are killed in terrorist attacks, yet a huge proportion of the population seems to think that spending hundreds of billions each year on "anti-terrorism" is a worthwhile use of resources.