Comment by gmueckl

I have news for you: those systems already exist and they work. The "insurmountable" development work has already been done. How long you can safely look away from the road is determined mostly by physics and has hard bounds. More than ~5 seconds is never OK while the vehicle is on a public road. At speed, a single second can be a second too long. The problem isn't that the road looks clear now. The problem is that this can change instantly, without warning and in the most surprising ways at any moment. A kid running into the road from behind a car, an object falling onto the road, an animal jumping onto the road from the brush/ditch/tree-line... the list goes on. Forcing the driver to pay attention is good. There is no massive situational leeway.