What is CMAS?

The Congestion Monitoring & Advisory System (CMAS) is a portable, real-time, automated smart work zone system that  monitors vehicular speeds and traffic congestion at various points on a freeway, surface street and ramps; and advises motorists to take specific actions according to the location and degree of congestion on the freeway, surface street or on/off ramps.

Can CMAS be used on any freeway - whether there is a work zone or not?

Yes.  CMAS can be used on any freeway that experiences congestion or crashes.  It can be used on freeway with or without work zones.  CMAS is expected to advise motorists to take specific actions based on the real time traffic conditions on a freeway, ramp or on/off ramps with or without work zones.

What are the expected benefits of CMAS ?

The system encourages motorists to take alternate routes when delay exceeds a given threshold value and advises motorists to merge or prepare to stop. The system reduces spillover at freeway off-ramps.

What kind of equipment and communication devices does CMAS use?

CMAS uses microwave radar sensors to monitor traffic flow on each lane of the freeway, up to eight lanes. However, other sensors that can provide contact-closure signals can be used, if necessary. CMAS  uses radios/modems (or cellular routers, if necessary) to communicate among various equipment including changeable message signs and trailers

Can CMAS display travel time or delay information on any changeable message sign?

Yes, PDP Associates works with the supplier or manufacturer of the CMS so that it is integrated with CMAS.

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