"traffic speed" is a correct and usable phrase in written English.
You can use it to refer to the speed at which vehicles are moving, usually on a road or highway. For example, "The police warned drivers to slow down due to high traffic speed on the highway."
Waze's app automatically gathers information from drivers' phones about traffic speed, then reroutes other drivers accordingly.
(Average traffic speed: about seven miles per hour, no faster than a running possum).
Moving at a moderate downtown Rijeka traffic speed (about 20 miles an hour), I spied a squad car maneuvering alongside.
Many residential communities like ours have observed roads and traffic volume and traffic speed grow around them.
Oxfordshire, facing a nearly $1 million trim in its road safety budget, has been forced to shut down all of its 161 traffic speed cameras.
For example, wireless providers like AT&T and Sprint are looking into applications that would use drivers' GPS smartphones to monitor traffic speed in real time.
The monitors collect information on lane occupancy and traffic speed, and the data then is supposed to be transmitted live to electronic message boards and other devices.
The Nuvifone also receives real-time traffic details; color-coded road lines represent traffic speed, and the unit offers to route you around them.
Passions about the plazas run particularly hot among taxi drivers, a few of whom expressed horror on Thursday about the effect on traffic speed.
Three hundred and sixty-six miles were added in the seven years before the slowdown began, even as average traffic speed increased.
Highways might have sensors that instantaneously measure traffic speed and spot areas of congestion simply by tracing patterns of cellular-phone use.
