Electronic E quipment Variable-message signs, or VMS, are electronic equipment which may display different traffic messages consistent with the requirements of a selected road. Permanent VMS displays are mounted on large sign structures overhead or alongside the road. These devices are often placed on urban freeways which have traffic problems. Portable CMS (PVMS) panels are usually mounted on trailers, although some could also be carried by trucks. they're often utilized in work zones or other events that disrupt . A traffic signal , also referred to as traffic light , stop light, stop-and-go lights, may be a device positioned at a road intersection, zebra crossing , or other location so as to point when it's safe to drive, ride, or walk employing a universal code (and a particular sequence, for that are colors blind).Nowadays, a red light meant traffic altogether directions had to prevent . A traffic light meant cross-towntraffic would need to slow and a green li