| 摘要 |
Systems and methods for traffic control use scanning transmissometers to determine visibility along an extended stretch of roadway. When areas of decreased visibility are detected, such as dense localized pockets of fog, appropriate warning information is provided to drivers over warning devices positioned along the roadway. Information from the transmissometers is used to develop a speed profile, that is an indication of safe speed as a function of position along the roadway. Traffic sensors detect variations in behavior from that specified by the warning devices, such as a very slow vehicle, and modifies the warning information according. A computer readable medium contains a computer program for implementing the systems and methods.
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