Designing this machine vision system is insurmountable. It will never be actually good at its stated purpose, because how much you can look through some window or glance back at your kids is decided by the outside environment and it will be impossible to fit accurate judgement of it in the computers in the car.

Also, lane assist fucking sucks. It places all cars in the same place on the road, i.e. all wear is in the same place as well, and in relation to the marked edges of the road, which often isn't the natural placing in curves and so on. As a consequence roads likely need maintenance more often, and as a proficient driver that does not let the car have opinions about placement on the road one commonly has much smaller margins when placing the car in the nice trajectory through a curve due to the sunken lanes from the assisted cars.