Humans generally look at it, make an informed guess and drive accordingly. The recent Tesla accident is a great example of how even the best optics can be blown out by environmental factors like sun, whereas a human would likely readjust their vantage point, lower the sunshade, put on sunglasses or even pull over if they are unable to cope.

Comparatively, the car did not attempt to do any of this and actually didn't even realize its cameras were in a state of failure.