The travel aid project is an operational test of an in-vehicle signing and variable speed limit system on Washington Intrastate 90 over the Snoqualmie pass. The purpose of the Travel Aid project is to improve safety and reduce accidents, and to increase the availability of traveler information to drivers in the Snoqualmie Pass area, a mountainous area that experiences extreme weather conditions. The project will display variable speed limits and other safety messages on variable message signs and in-vehicle equipment to reflect traffic and roadway conditions. This paper will discuss the methods used to prepare the design of the 900 Mhz radio system used to provide a communication path to the road-side devices. The design used both computer methods and field testing to verify the feasibility of the radio network. The area is very mountainous making direct radio paths difficult to achieve.


  • English

Media Info

  • Features: Figures;
  • Pagination: 6p

Subject/Index Terms

Filing Info

  • Accession Number: 00724841
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 27 1996 12:00AM