Does Regional Travel Time Unreliability Influence Mode Choice?

Travel time unreliability increasingly is becoming a measure of transportation system performance. This study focuses on regional patterns of travel time unreliability in the Chicago metropolitan area and evaluates whether unreliability affects commuter mode choice decisions. Global positioning system travel survey data for Chicago is used to build a regional model of travel time unreliability. The results suggest that unreliability varies spatially during different time periods, but that the average overall network unreliability varies little across times in the day. Unreliable automobile travel conditions appear to induce mode switching to transit. This influence is strongest when service by train is already faster than by car. The overall findings from this study suggest that although travel time unreliability is important, it has limited influence as a driving force in mode choice decisions.


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  • Accession Number: 01356000
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Sep 23 2011 12:32AM