Smart Signs System

Active Traffic Management

Part of making travel safer and more reliable is by using new technology, such as CDOT’s Smart Signs system. CDOT’s US 36 Smart Signs collect information from cameras and vehicle detectors and display current weather and traffic conditions on digital overhead signs. Drivers can view these cameras on

US 36 is one of two corridors in Colorado to have this system. Smart Signs will also be implemented on southbound I-25 from 120th Avenue to US 36, as part of the North I-25 Express Lanes.

How Smart Signs Work

The new overhead signs reduce accidents and keep traffic flowing by providing advance notice of traffic conditions such as upcoming lane closures, collisions, and backups. Symbols will alert drivers to take action, such as reducing speeds as they approach areas of congestion, or to change lanes if there is a closure ahead.

The system is designed to mitigate collisions and accidents by preventing stop-and-go traffic and inconsistent speeds. The lowest advisory speed is 35 mph, even if traffic is moving slower. Just like a static speed limit sign, adverse traffic conditions may require drivers to drive slower than the posted speed.

CDOT will also take into account adverse weather conditions such as icy conditions and sudden storms that can impact safety during peak travel times. Similar systems have proved successful in Washington, Minneapolis and Metro DC, resulting in fewer collisions and reduced vehicle emissions.


US 36 Express Lanes Project Fact Sheet