Changeable Message Signs (CMS) and Safety Messages

Changeable Message Signs (CMS), also called dynamic or variable message signs, are programmable signs used on highways nationwide to give drivers real-time information such as traffic updates, roadwork warnings, Amber Alerts, destination arrival estimates, parking information, and other traffic and safety related information. CMS allow motorists to take immediate action in response to information—to slow down or change routes, for example—leading to safer driving conditions and less congestion.