A method and architecture for constructing, updating, and maintaining a map database extended with real-time roadway speed data is described. The method and system include a plurality of mobile reporting devices, communication channels, and servers that receive the speed and incident reports and maintain...http://www.google.se/patents/US20070155360?utm_source=gb-gplus-sharePatent US20070155360 - Methods, Apparatuses and Systems for the Reporting of Roadway Speed and Incident Data and the Constructing of Speed Map Database
