I like the idea a lot, but in my experience they tend not to be very accurate, which is disappointing.
Oddly enough, the most reliable one I've seen so far is ODOT's official website, which I suppose makes sense since they have access to traffic cameras, realtime signal data, and a lot of other stuff that even companies like Google don't really have, especially in a place like Ohio.
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(Also a general "fuck you" to minarchist types who want government to disappear.)