Traffic detection today: Still hardware-based but new generation https://www.smartcitiesworld.net/news/mobility-companies-team-for-hybrid-traffic-detection-system-7218
https://www.smartcitiesworld.net/news/mobility-companies-team-for-hybrid-traffic-detection-system-7218
A lot of data are available: what is next?New York City tunnels get new traffic analytics from GridMatrix | Traffic Technology Today