Changeable Message Sign Displays During Non-Incident, Non-Roadwork Periods (2008) / Chapter Skim
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Permanently mounted changeable message signs (CMSs) , sometimes referred to as variable message signs or dynamic message signs, are used primarily to display real-time messages for non-recurrent, environmental, special event traffic, and other special operational problems.
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messages other than travel time, there is uncertainty as to the best type of messages that should be displayed during non-incident/non-roadwork periods. There is a trend in urban areas toward increased use of travel-time messages as an alternative to leaving CMSs blank during non-incident/non-roadwork periods.
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Messages that provide the beginning and end of traffic congestion are helpful to the motorists. Because the locations and limits of congestion change very quickly, several TMCs experience difficulty in displaying accurate messages.
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