[aprssig] Traffic alerts in APRS

William McKeehan mckeehan at mckeehan.homeip.net
Mon Apr 4 21:46:41 EDT 2005

I have been thinking about generating traffic "objects" in APRS. I my
research, I found the following site:


Which says:
CARS (Condition Acquisition and Reporting System) is a condition reporting
system now used by 10 states to assemble traveler information and to support
the dissemination through such things as Traveler Information Web Pages, 511
Telephone Systems, and Highway Advisor Radio/Low Power FM transmitters.

It further says:
The ERM messages support detailed, real time event summaries or overviews for
exchange between TMCs, and from TMCs to ISPs. In addition, the standard format
allows subsystems to easily pass on information to the public.

CARS uses the national ERM model to transmit and receive data via XML.

I have contacted them and asked about getting access to their data to use in
the generation of APRS objects. The response that I received said in part:

We are currently testing protocols to exchange informaiton across
jurisdictional boundries, the message structure is based on national
intelligent transportation systems (ITS)standards.  As this work matures we
will be ready to work with others, right now state to state exchanges are
still a challenge. But then again, we are working with services like On-Star
to assist in the exchange of emergency information and can now receive
information from them. Look forward to getting more information on APRS and to
explore this further with you.

On Mon, April 4, 2005 6:45 pm, Jim Lux said:
> Has anyone ever taken the real time traffic data from CalTrans or the CHP
> and turned sigalerts and warnings into APRS messages?
> Now there's a useful tactical information stream..
> Jim W6RMK
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William McKeehan
Internet: mckeehan at mckeehan.homeip.net

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