Connected Vehicle at 4.9GHz for Transit ITS - Unified Communication Architecture for an ITS Enterprise and Pathway to DSRC

King County Metro Transit (Metro) serves 1.7 million people located in King County, Washington. Metro operates a fleet of about 1,300 vehicles -- including standard and articulated coaches, electric trolleys, and dual-powered buses. These vehicles serve an annual ridership of 100 million passengers within a 2,134 square mile area, serving the cities of Seattle, Bellevue and the surrounding area. In 2006, Metro desired a regional expansion to its enterprise network to provide an access layer along high use corridors of the transit service area. This access layer would provide ITS enhancements that include roadside traffic signal control, signal prioritization, enhanced GPS location resolution of the existing Automatic Vehicle Location (AVL) system, Real Time Traffic Information System (RTIS) enhancements, Customer Itinerary Planning, and on-street electronic fare collection. The solution is an operational implementation of the Connected Vehicle vision of the U.S. Department of Transportation (US DOT) that uses the FCC allocated 4.9 GHz Public Safety band for the wireless component. Connected Vehicle is described within the National ITS Architecture and supported by US DOT. This vision promotes a surface transportation system for travelers to have comprehensive and accurate information on travel options - transit travel times, schedules, costs, and real-time locations; driving travel times, routes, and travel costs; parking costs, availability, and space reservation information; and the environmental footprint of each trip. The Metro deployment is the first of its type in the nation to be based upon the Connected Vehicle concept. Connected Vehicle, however, is generally associated with the 5.9 GHz Dedicated Short Range Communications (DSRC) spectrum for wireless connectivity. Does this hybridization‘ that mixes Public Safety with DSRC use conflict with the US DOT vision? Does the use of 4.9 GHz spectrum within an ITS deployment negate the goal of Interoperability with Public Safety? How does each, 4.9 GHz and 5.9 GHz, relate to the larger hierarchical Enterprise network? Why did King County choose Public Safety 4.9 GHz wireless? This paper provides a discussion of how DKS Associates, working with King County Metro Transit and Office of Information Resources, designed and deployed an IP enterprise architecture to manage these differences in a way that enhances the goals of both Connected Vehicle and achieve Interoperability between Public Safety and Transit ITS organizations.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Glossary; Maps; Tables;
  • Pagination: 13p
  • Monograph Title: 18th ITS World Congress, Orlando, 2011. Proceedings

Subject/Index Terms

Filing Info

  • Accession Number: 01485086
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 25 2013 12:31PM