What is ASIS?

The Advance Speed Information System (ASIS) is a portable, automated, real-time smart work zone system that  monitors vehicular speeds at various points on a freeway and displays downstream vehicular speeds at upstream locations.

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

Yes.  ASIS can be used on any freeway that experiences congestion and incidents.  It can be used on freeway with or without work zones. ASIS is expected to reduce rear-end crashes that are often caused by drastic actions on the part of the motorists due to lack of traffic speed information ahead of them.

What are the expected benefits of ASIS ?

ASIS is expected to reduce rear-end crashes by allowing motorists to adjust their speeds and reduce the elements of “surprise”.

What kind of equipment and communication devices does ASIS use?

ASIS 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. ASIS  uses radios/modems (or cellular routers, if necessary) to communicate among various equipment including changeable message signs and sensor trailers.

Does ASIS need a "base station" ?

No, it does not. The changeable message signs (CMSs) or sensor trailers are stand-alone devices that can operate without a "base station". They can communicate with each other through radios/modems (or cellular routers, if necessary) and the CMSs can display traffic speeds that motorists would encounter ahead of them.

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