[aprssig] Traffic Speed Monitoring?

[Stephen H. Smith]

On 11/12/2011 2:52 PM, Bob Bruninga wrote:
> Question?
>
> I just realized how tribvial it is for the state to gather traffic speed.  THey just put EZPASS detectors on underpasses and then keep track of how long it take any given ID to go from one detector to the next.
>
> Is this how they do it?

Not mostly.  You must not get out of eastern areas laced with toll roads 
much....   In most of the country, without many toll roads, people just don't 
have the EzPass transponders.

In California, it's thousands of induction sensors embedded in the pavement 
detecting the passage of metallic masses moving over.


>   I had heard they used cell phones

The commercial traffic services such as TMC (that supply the real-time traffic 
data to car GPS devices over FM subchannels) use cell phone traffic to some 
degree, but I don't think official government highway agencies do much.

> , ut I think the EZ pass woiuld be more straight forward...
>
> Bob, WB4APR
>
>
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