[aprssig] Traffic alerts in APRS

Robert Bruninga bruninga at usna.edu
Mon Apr 4 22:26:01 EDT 2005

Yes, this is exciting.  I have been wanting to tie in to Traffic
data since 1995 or so.  So to implement it, please consider
the TRAFFIC.TXT readme file when you get to that point.
So that the traffic objects are seamless with the way we
are already doing it....
Thanks.  Bob

>>> mckeehan at mckeehan.homeip.net 4/4/05 9:46:41 PM >>>
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
system now used by 10 states to assemble traveler information and to
the dissemination through such things as Traveler Information Web
Pages, 511
Telephone Systems, and Highway Advisor Radio/Low Power FM

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
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

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
still a challenge. But then again, we are working with services like
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
> 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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