It will still take some time for the fully autonomous car to arrive, and they may never be able to navigate Delft city centre where you have to deal with ten pedestrians and fifteen cyclists simultaneously. Not to mention a plethora of small bridges, frequent changes in traffic situations and the erratic non-law-abiding behaviour of said pedestrians and cyclists.
But the goal of millimetre wave radar is not to make this possible, but to improve road safety in general. The technology may require another step reduction in resolution (to see the motor cycle overtaking the oncoming truck), but it is a getting there fast. It will soon become compulsory technology, just like the seatbelt and the airbag. Read more about millimetre wave car rader here.