A traffic information system generates a traffic information frame for selected roads within a broadcast area by receiving traffic information from a traffic data source, obtaining road vector definitions for one or more roads identified in the traffic information, associating the road vector definitions with longitude and latitude to link the traffic information to particular roads, creating a Transport Protocol Experts Group (TPEG) traffic message, including the traffic information and the one or more roads associated with the traffic information, obtaining bounding area definitions of bounding areas associated with the particular traffic incident, combining cached TPEG messages into a composite TPEG frame using the bounding area definitions and broadcasting the TPEG frame to at least a primary bounding area.