From the NY Times: Navigating With Feedback From Fellow Drivers . The article describe a GPS device from Dash Navigation in which every car is a probe, that reports information back other drivers in the club. This is an idea (hardly original I suspect) I analyzed in Levinson, D. (2002a) The Economics of Traveler Information from Probes. Public Works Management and Policy 6(4) pp 241-250 (April). The model in the paper implies probe information can be very good for detecting incidents, but will be almost useless for recurring congestion, because the lag in the data will be too long to take advantage of it.