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From the Top Down: Other Input to the Protocol Stack–Advanced Data Services
Published in David P. Maxson, The IBOC Handbook, 2007
iBiquity has created an automotive telematics service that delivers traffic information to the vehicle dashboard. The Traffic Message Channel (TMC) is a generic service that supports traffic messaging information from a variety of service providers to a variety of mobile products. By the end of 2006, Traffic information provider Clear Channel Traffic had launched the HD Radio version of its service in 48 markets in the U.S., paralleling the almost 20 times slower RDS TMC already in use. Consumer electronics manufacturers, including Audiovox, TomTom, Garmin, and Cobra, were already offering TMC-capable navigation products for RDS receivers and began offering HD Radio TMC devices.5 In addition to providing up-to-the-minute traffic information, the TMC can deliver timely weather forecasts and provide updates to the data contained in navigation systems. For instance, navigation systems contain data describing points of interest, including such things as restaurants stores and services. Point of Interest (POI) data transmitted over the TMC keeps subscribers’ navigation system maps up-to-date. In addition to Clear Channel Traffic, other traffic and mapping service providers partnering with iBiquity include Traffic.com, TrafficCast, SmartRoute Systems, Shadow Broadcast Services, Navteq, and TeleAtlas.
Operational performance evaluation of adaptive traffic control systems: A Bayesian modeling approach using real-world GPS and private sector PROBE data
Published in Journal of Intelligent Transportation Systems, 2020
Zulqarnain H. Khattak, Mark J. Magalotti, Michael D. Fontaine
While the GPS floating car runs provide very detailed data on vehicle trajectory, the quantity of data available was limited due to manpower constraints. In order to examine long-term performance, probe data from INRIX was utilized as an additional source for examining data over time. Several studies have shown that INRIX data passes accuracy benchmarks and can be used for performance evaluation (Haghani, Hamedi, & Parvan, 2013), (Fontaine 2012). In contrast to the GPS floating car data, INRIX provides estimates of mean speed and travel time on roadway links (called traffic message channel or TMC links) and does not contain individual vehicle level information. Thus, it can be a useful source for looking at average performance but cannot be used to evaluate performance measures like stops.