Simplifying high-tech highway to much cheaper way.

I recently read about the automated high-way in Germany. Now they have alternative on how to lessen the expenses instead of converting all highways and road to digitized highway. They are going to embed sensors and telecommunication device with our cars. How useful is this? Can it really protect our safety or the human perceptions and instincts are still the best way to avoid accidents? What are the sensors that will be use and how is it going to work?

Please send feedback.

Thank you!