A variable message sign (VMS), also known as a changeable message sign (CMS), is a programmable traffic control device that can usually display any combination of characters. These signs may be either portable, in which case they can be attached to a trailer and driven to a desired location, or permanent, in which case they are usually installed above the roadway. Highway advisory radio (HAR) units can be used to transmit traffic information to a vehicle's AM radio.
Guidelines for the Effective Operation and Control of VDOT Permanent Variable Message Sign and Highway Advisory Radio Units: State of the Practice and Recommendations
1996
41 pages
Report
Keine Angabe
Englisch
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