ACCELERATION NOISE, POWER SPECTRA, AND OTHER STATISTICS DERIVED FROM INSTRUMENTED VEHICLE MEASUREMENTS UNDER FREEWAY DRIVING CONDITIONS

A STANDARD PASSENGER VEHICLE HAS BEEN INSTRUMENTED TO MEASURE FORE-AND-AFT ACCELERATION AND VELOCITY, AND MOST SIGNIFICANTLY, A DIGITAL DATA RECORDING AND PROCESSING SYSTEM HAS BEEN DEVELOPED AND IMPLEMENTED THAT PROVIDES FOR CONVENIENT AND RAPID REDUCTION OF THE MEASURED DATA. THIS SYSTEM, CONSISTING OF BOTH HARDWARE AND SOFTWARE, HAS BEEN CHECKED OUT AND DEBUGGED, AND HAS BEEN APPLIED TO THE COLLECTION OF A FAIRLY EXTENSIVE SET OF FIELD DATA OVER A HEAVILY TRAVELED URBAN FREEWAY. THE MOST EXTENSIVE SUBSET OF DATA WAS COLLECTED USING SIX DRIVERS, EACH ON A DIFFERENT DAY, MAKING EIGHT RUNS FOR EACH DIRECTION OF FLOW (DURING THE MORNING PEAK TRAFFIC PERIOD). STATISTICS COMPUTED FROM THE DATA INCLUDED AVERAGE ACCELERATION, AVERAGE VELOCITY, STANDARD DEVIATION OF ACCELERATION (OR ACCELERATION NOISE), STANDARD DEVIATION OF VELOCITY, AUTOCORRELATION FUNCTIONS, POWER SPECTRAL DENSITIES, TRAVEL TIME, AND DISTANCE TRAVELED. ACCELERATION NOISE HAS BEEN RELATED TO VOLUME AND DENSITY, AND HAS BEEN SHOWN TO HAVE A CORRELATION COEFFICIENT OF 0.75 WITH TRAVEL TIME. INDICATIONS ARE THAT INDIVIDUAL DRIVER DIFFERENCES ARE MORE EVIDENT WITH ACCELERATION NOISE THAN WITH TRAVEL TIME. SPEED-VOLUME-DENSITY RELATIONSHIPS ARE ALSO EXAMINED. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 13-33
  • Monograph Title: Traffic flow characteristics
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00223318
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 13 1970 12:00AM