Man cleared the bushes and paved a path to walk along safely. He evolved and when he invented the wheel and wheel carts, he made the path a little wider; this was circa 4 century BC. Slowly over the course of 2200 years wheels evolved in various facets when it met the engine technology and automobiles were created. This journey still continues and we have got n-lane roads made out of asphalt, concrete and recently plastics!
A step ahead we will be having roads that have photovoltaic underneath them and produce energy out of the sun all the day along. This is still in very pre-mature stage and prototypes are being carried out (http://solarroadways.com/). These roads are expected to have displays that would send our emergency information to the road users. More information on their construction is shared in their web-site.
Imagine such roads with loads of silicon circuitry underneath them...all sending out signals with a programmed purpose.
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