[aprssig] Real time traffic data, more

Jim Lux jimlux at earthlink.net
Mon Apr 4 19:05:31 EDT 2005

Caltrans's site uses a Java application running on your browser and can 
display little dots for speed.  It should be possible to write an 
application that shoots the same messages back to the Caltrans server and 
parses the output.


The application is called Jshape (v3.0), but some poking around might find 
a document that describes the interface.

For instance, I found a faq:

I see lots of companies publishing maps with Caltrans speed data. How can I 
get it for my company?

Contact us through the 'comments/suggestions' button on the California 
Smart-Traveler and we'll work to provide your company with the same data 
sets. Caltrans data sets include urban freeway speeds, changeable message 
sign messages, closed circuit television images, lane closures, and highway 
weather conditions. The information is provided without charge, but we 
cannot provide any warranty for accuracy or delivery reliability. Delivery 
may be stopped at any time due to traffic management needs, concerns for 
individual privacy, homeland security, or information systems technology 

Cal smart traveller URL is http://caltrans511.dot.ca.gov/faqs.html

The CHP real time data site is at
but would need some clever parsing to turn text descriptions into positions 
for APRS use.  It uses thomas bros map page/grid for georeferencing

Jim Lux, W6RMK 
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