Traffic event detection systems are used for safety purposes in tunnels and on highways. Systems are based on video or radar technology.
The events that such systems detect are:
– a stopped vehicle
– a vehicle driving in the wrong direction
– a pedestrian on the road
– incidental items on the road
– significant decrease in visibility
– fire (still does not replace a fire alarm system)
– change in the average speed of the traffic flow (not applicable to a single car)