I would think that redundancy would be useful in day to day if weather or lighting (day/night/glare/sunset/headlight limits) was included. As an example in rain or fog radar may be able to detect pedestrians (etc) when cameras could not (at least at their normal precision). Similarly with the different lighting conditions. I would think in general that multiple types of sensors would add to the confidence level of identifying all types of objects. Just a thought. Aside: in my post above I meant '...quite a distance...' and not '...quite a difference...'