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Dynamic Message Signs (DMSs), also known as variable-message signs, are traffic control devices that provide real-time traveler information. These electronic signs can be used for the purposes of displaying traffic warning, regulation, routing, and management, and they are a major component of advanced traveler systems implemented by state departments of transportation (DOT). DMSs are commonly found on highways, but also make appearances on rural roads.
The messages conveyed to drivers through DMSs include emergencies, such as evacuations or closures, hazardous road conditions, such as severe weather conditions and work zone activities, traveler information and suggested alternative routes, travel times, ozone alerts, advance time notice for scheduled incidents, such as closures, and approved standard service announcements associated with special campaigns or other public information that reduces congestion.
The utilization of dynamic message signs, due to their visibility and basic comprehensibility, can yield some significant benefits. For example, during scheduled road work, DMSs have been shown to generate major increases in traffic flow, as they orderly guide drivers through established detours. This heightened traffic efficiency often results in a corresponding growth in time savings and operating cost savings.
NEMA TS 4- &#; Hardware Standards for Dynamic Message Signs (DMS) with NTCIP Requirements standardizes the different units of dynamic message sign equipment. It is concerned with the electrical requirements, environmental requirements, mechanical construction, controller, and display properties of DMSs. The specifications detailed in this standard are useful for assuring the reliability of dynamic message signs during their daily use and after continuous interaction with anticipated forces, such as weather patterns.
NEMA TS 4- is intended for use with dynamic message signs using NTCIP (National Transportation Communications for ITS Protocol) recommendations. The DMSs that utilize the NEMA standard for guidance also derive specifications from NTCIP v03 &#; Object Definitions for Dynamic Message Signs (DMS). This standard specifies the logical interface between dynamic message signs and the host systems that control them (the central systems). By addressing the architecture of DMS systems, NTCIP v03 can assure the delivery of timely and reliable information to the traveling public.
Adherence to the guidelines in NEMA TS 4- and NTCIP v03 allows for dynamic message signs to be installed and used in a manner that captures their benefits for the public. For information on the 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.
DMS are the last chance to communicate with drivers about roadway incidents and work zones that may affect their travel. Since using a smart while driving is not safe, DMS provide quick and concise information about the traffic ahead to allow drivers to plan their routes accordingly -- reducing congestion and travel time.
MoDOT collaborates with IDOT, who is a partner in the Gateway Guide program, to coordinate relevant messages on both sides of the river. This ensures that the two states provide the best possible information to drivers who can then make informed decisions.
Arterial message boards
MoDOT has smaller versions of the Dynamic Message Signs on high-volume major state roads. These type of message boards can be found on some of the following roads:
These signs will work in conjunction with speed sensors and traffic cameras to help provide information on travel times, upcoming lane or roadway closures, crashes, and congestion.
These digital boards are placed alongside the roadway, on state property. They are in advance of major cross streets, with enough distance for drivers to make a decision on their routes. MoDOT makes sure people can see the signs easily and makes sure that the signs will not significantly impact adjacent property owners.
These signs have a very narrow viewing angle, which should prevent light spilling over onto the property of adjacent properties. They also have a solar sensor which dims the light during nighttime hours.
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