The TomTom RDS-TMC Traffic Receiver gets traffic information on the go, to your GO. For the one-off cost of the receiver you can get traffic updates and let your GO reroute you around congestion.
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Buy TomTom RDS-TMC Traffic Receiver - TMC module for GPS receiver at Amazon
FYI, the receiver does not look like the picture, but the important this is that it is a pin-type connection (some require a USB connection - if so, this is not for you!)
All I had to do was plug it in to get traffic info. I live in Birmingham, AL. So far, I haven’t used it during some of the worst traffic. I have noticed it won’t report “congestion” (your typical 5 o’clock slowness) but only atypical delays, so just be aware of that. Otherwise its fine.
UPDATE:
I went to Atlanta today where they have much worse traffic. On the way home, cars started to slow and I could see impending bumper to bumper traffic ahead. At that moment, the GPS alerted me there was traffic ahead and I had to option to chose a faster route. I got off at the next exit as advised. On the overhead bridge, I could see the others in traffic as I continued to make my way along a clear route. I’m convinced.
As far as picking up a signal, I only lost a signal once during the most remote part of I-20 for about 15 mins, otherwise it was “green” the entire time.
Received reception at 97.5 in NY. Shows some traffic, but often none is shown while I am siting in it. no problems with reception.