The good folks at DIYcity have just unleashed DIYtraffic on the world.
SMS traffic updates have existed for a while, but each locality uses its own system and has its own standards. The goal of DIYtraffic was to create "one single application that can be configured to work anywhere, in any city or town, with very little effort." This unified platform is available for any community/city/locality to use and build on together like an open source project. It's designed to be easily configurable for any city/town in the US, but will work outside the US, too, if you have a feed of traffic updates.
Read the full post over at /Ground.