"Other world-class cities have used satellite-based tracking systems for more than a decade to inform waiting passengers exactly when their bus or train will arrive."

Chicago is piloting a GPS based bus tracking system in an effort to try to minimize the up to 1hr+ wait time that can occur between busses.  Finally!!! Even if it doesn't improve time, it will at least let you know when you should leave the house/office/whatever to avoid a long wait in the blistering cold!!!

http://www.chicagotribune.com/technology/chi-0605080207may08,1,6710891.column