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Dynamic Message Signs (DMSs), also referred to as variable-message signs, are traffic control devices that deliver real-time information to travelers. These electronic displays are crucial for presenting traffic warnings, regulations, routing, and management information. They are key components of advanced traveler information systems adopted by state departments of transportation (DOT). While DMSs are frequently spotted on highways, they are also utilized on rural roads.
Messages delivered to drivers via DMSs encompass emergencies such as evacuations and closures, hazardous road conditions including severe weather and construction activity, traveler information, alternative route suggestions, travel times, ozone alerts, and advanced notices for scheduled incidents like closures. They also communicate standard service announcements pertaining to special campaigns or public information aimed at alleviating congestion.
The implementation of dynamic message signs, due to their visibility and straightforward messaging, can provide substantial advantages. For instance, during scheduled road projects, DMSs have demonstrated significant improvements in traffic flow by efficiently directing drivers through designated detours. This enhanced traffic efficiency often correlates with increased time savings and reduced operational costs.
NEMA TS 4- ' Hardware Standards for Dynamic Message Signs (DMS) with NTCIP Requirements aim to standardize the various units of DMS equipment. This standard addresses electrical specifications, environmental considerations, mechanical design, controller attributes, and display characteristics of DMSs. The criteria outlined in this standard are essential for ensuring the dependability of dynamic message signs during daily use and after prolonged exposure to expected forces, such as weather changes.
NEMA TS 4- is specifically designed for dynamic message signs that follow the guidance of NTCIP (National Transportation Communications for ITS Protocol) recommendations. DMSs adhering to the NEMA standard also obtain specifications from NTCIP v03 ' Object Definitions for Dynamic Message Signs (DMS). This standard delineates the logical interface between DMS and the control systems that manage them (central systems). By addressing DMS system architecture, NTCIP v03 assures the timely and reliable flow of information to the traveling public.
Compliance with the standards set forth in NEMA TS 4- and NTCIP v03 allows dynamic message signs to be installed and utilized in ways that optimize their benefits for the public. For details on federal requirements for DMSs, please refer to the Manual on Uniform Traffic Control Devices (MUTCD).
NEMA TS 4- ' Hardware Standards for Dynamic Message Signs (DMS) with NTCIP Requirements and NTCIP v03 ' Object Definitions for Dynamic Message Signs (DMS) are available on the ANSI Webstore.
Dynamic Message Signs
DMS serve as a crucial communication tool for drivers concerning roadway incidents and work zones that may influence their travel. Since using a smartphone while driving is unsafe, DMS provide quick and clear information about upcoming traffic to help drivers plan their routes, reducing congestion and travel times.
MoDOT collaborates with IDOT, which partners in the Gateway Guide program, to synchronize relevant messages on both riverbanks, ensuring that both states provide the clearest information to drivers, enabling them to make well-informed decisions.
Arterial message boards
MoDOT has deployed smaller versions of Dynamic Message Signs on major state highways with high traffic volumes. These message boards can be located on various routes:
These signs work alongside speed sensors and traffic cameras to provide information about travel times, upcoming lane or roadway closures, accidents, and congestion levels.
Positioned alongside the roadway on state property, these digital boards are set up before significant intersections, allowing drivers sufficient distance to decide on their routes. MoDOT ensures that these signs are easily visible while minimizing the impact on adjacent property owners.
Designed with a narrow viewing angle, these signs prevent excess light from spilling onto nearby properties, featuring solar sensors to dim the lights during nighttime.
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