An example of center to center communications is two traffic management centers that exchange real-time information about the inventory and status of traffic control devices.
He applied for a patent for a man-powered traffic control device using a crank in 1922, but his invention is said to have never reached the prototype stage.
The law also provides that whenever the funeral escort vehicle enters an intersection, the other vehicles can follow without regard to any traffic control device, provided they exercise reasonable care.
Typical traffic engineering projects involve designing traffic control device installations and modifications, including traffic signals, signs, and pavement markings.