China gold supply traffic light 

VMS's were deployed at least as early as the 1950s on the New Jersey Turnpike.[3] The NJ Turnpike's signs of that period, and up to around 2012,

were capable of displaying a few messages in neon, all oriented around warning drivers to slow down: "REDUCE SPEED", followed by a warning of either

construction, accident, congestion, ice, snow, or fog at a certain distance ahead.[4] The New Jersey Turnpike Authority replaced those signs

(along with 1990s-vintage dot-matrix VMS's along the Garden State Parkway) with more flexible electronic signs between 2010 and 2016.

The current VMS systems are largely deployed on freeways, trunk highways, or in work zones.[citation needed]