A human brain has a datacenter's worth of processing power using algorithms tuned by hundreds of millions of years of evolution to be excellent at divining the underlying forms behind visual information. We can't put that on a car (yet).

Also, Lidar can avoid some of the optical illusions that will cause humans to crash. E.g. [1]

And, hopefully, precise data will let future computerized cars drive more precisely than humans can.

[1]http://www.news.com.au/lifestyle/real-life/wtf/optical-illus...