Until now, we use helicopters to perform traffic control. But we do know that drones could be used for monitoring traffic and it is more efficient and has more of use. Drones will not only use to monitor road traffic, it can be used to catch drivers that over speed.
Kindly do back reads of comments here,
traffic monitoring is not with helicopters anymore.
most of the countries are using CCTV (live camera) to monitor the high-way and crimes at road.
Correct, and they will use also to provide a person that can handle and solve the cause of traffic whereas they can easily go in the situation like for example if there is an accident they will easily bring to the hospital as well, and can easily gave a first aid on the victim.