Here are a couple of them who tweet about traffic in Hawaii:http://twitter.com/dt808traffichttp://twitter.com/AM940http://twitter.com/Krater96http://twitter.com/hawaiian105kine
Kind of wonder how you will incorporate them into Waze though, and how you will have them post the announcement on the right spot, I kind of don't see how as the tweets are, imho, a bit too vague for that.
Wouldn't it be better to use something like the following?http://www4.honolulu.gov/hpdtraffic/
that one gives full information, what happened, where exactly and so on... kind of wonder where they pull the data from though..
Or here's another one also that could perhaps be used for the US, less informative but oh well:http://www.beatthetraffic.com/mobile/index.aspx