Changeable message signs

Definition

Changeable message signs (CMS) are electronic displays used on roadways to convey real-time information to drivers, such as traffic conditions, warnings, or directions. These signs enhance traveler information systems by providing timely updates and improving roadway safety and efficiency. By using CMS, agencies can communicate important messages quickly and effectively, adapting to changing traffic situations and promoting safer driving behaviors.

5 Must Know Facts For Your Next Test

1. Changeable message signs can display a wide variety of messages, including speed limits, lane closures, accident alerts, and travel time estimates.
2. They can be programmed remotely or set to automatically update based on data received from traffic sensors.
3. CMS are often strategically placed at high-traffic locations to maximize visibility and impact on driver behavior.
4. The use of changeable message signs has been shown to reduce crashes by informing drivers about hazards ahead and encouraging safer driving practices.
5. Integration of CMS with other Intelligent Transportation Systems enhances overall traffic management by facilitating coordinated responses to incidents.

Review Questions

• How do changeable message signs contribute to improved roadway safety and driver awareness?
  • Changeable message signs contribute to improved roadway safety by providing drivers with real-time information about changing conditions, such as accidents or road closures. By alerting drivers to potential hazards ahead, these signs allow them to make informed decisions and adjust their driving behavior accordingly. This proactive communication helps prevent accidents and enhances overall driver awareness of the roadway environment.
• Discuss the role of changeable message signs within the broader framework of traveler information systems and traffic management.
  • Changeable message signs play a crucial role within traveler information systems as they serve as a direct communication tool between transportation agencies and drivers. By integrating CMS into traffic management strategies, agencies can quickly disseminate critical information regarding traffic conditions and incidents. This real-time data helps manage congestion effectively and improves overall travel efficiency by guiding drivers on alternative routes when necessary.
• Evaluate the effectiveness of changeable message signs in mitigating traffic congestion compared to traditional static signage.
  • Changeable message signs are generally more effective in mitigating traffic congestion than traditional static signage because they provide dynamic updates that reflect current conditions. Unlike static signs that display fixed messages, CMS can adapt in real-time based on traffic flow and incidents. This capability allows for timely communication of detours or speed adjustments, helping to alleviate bottlenecks and improve the overall flow of traffic. The ability to react swiftly to changing circumstances makes CMS a valuable asset in modern traffic management strategies.

Related terms

Dynamic Message Signs: A type of electronic sign that can display variable messages based on traffic conditions, typically used for real-time traveler information.

Traveler Information Systems: Technological systems designed to provide users with current travel-related information, including traffic, weather, and road conditions.

Traffic Management Centers:

Facilities that monitor and manage roadway conditions, coordinating the use of various traffic control technologies like changeable message signs.