5900 Variable Message Warning Sign
Model #5900 Series
The 5900 Series LED Variable/Changeable/Dynamic message signs (known as VMS, CMS or DMS) are used in many applications that include stores, train and bus depots, sporting events and intelligent traffic systems. The VMS are electronic devices that can display a wide variety of messages that can be implemeted via a local or remote computer. A pre-defined message, that overrides a default message, can be displayed based on the condition of a traffic sensor (overheight vehicle detection system) and driver sinstructed to take action to prevent an accident.
There are several items that need to be taken into account in the selection of a VMS for traffic control applications.
- In general, a 1 inch high charatcer can be discerened at a distance of 50 feet. Therefore, if the viewing distance is desired to be 300 feet, the character height needs to be 6 inches.
- The message width (character per line) should be precise and worded so as not to confuse a driver. For example, the word "OVERHEIGHT" could be placed on the first line and the words "EXIT RIGHT" placed on the second line.
- The viewing angle of the sign (defined as half-brightness) should be 30 degrees for most highway applications. If the VMS is located on the right side of the roadway, the sign should be angled (not perpendicular to the road) to provide the best viewing angle. If the sign is located on an overhead structure, the sign should be angeled down (not parallel to the road) to provide best vieiwng angle.
- In those cases where the distance from the VMS to driver is short, such as parking garages, the viewing angle should be 70 degrees. As noted in paragraph 3 above, mounting adjustments may have to be made to insure the best viewing angle.
- To attract the drivers attention to the VMS, flashers (LED traffic heads) and/or bells can be mounted near the sign and activated for the same length of time as the VMS.
- To provide for additional functions, such as Amber alerts, the VMS controller shold be NTCIP compliant.
- Current technology in VMSs employ Red, Amber or Color (Red/Green/Blue) LEDs that allow the user a very flexable choice in reaching a decision for the best sign for a specific application.