Traffic information via phone

[TonyD]

Now that I am on an unlimited data plan on an iPhone I got to thinking about traffic information. I currently use a TomTom 910 with a traffic subscription. It is lousy, for 4 reasons -

1. Quality of information is appalling
2. Presentation of information on screen is downright dangerously illegible
3. Speed on an update is slow
4. Connection to the phone is very erratic (and non-existent to my iPhone, I use another phone just for traffic)

Is there a good website (doesn't have to be free) which would let me use an iPhone for traffic information. Conceptually it would be quite practical to come up with something that is very easy to read while driving particularly with the iPhone having such a large clear bright screen, and furthermore with unlimited data I could afford to have it constantly updating. I also use my iPhone as the basis of in car entertainment via its iPod functionality and connection to my car radio, however that wouldn't be a problem, it excels at multi tasking.
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Tony
(TT940)