https://phys.org/news/2018-05-wi-fi-road-kansas-city-tech.html

"Smart pavement is a factory-produced pavement system that transforms the road into a sensor, data and connectivity network for next-generation vehicles," said Tim Sylvester, founder, chief executive and president of Integrated Roadways.

The road system uses high resolution fiber optic sensors and other technologies inside the pavement to detect vehicle position in real time as well as roadway conditions. This technology would detect crashes as they occur, for instance, and automatically notify emergency responders to those crashes.