caa a22 4500 445890630 CHVBK 20180317145615.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s11116-011-9335-z doi (NATIONALLICENCE)springer-10.1007/s11116-011-9335-z Does regional travel time unreliability influence mode choice? [Elektronische Daten] [Matthias Sweet, Mengke Chen] Researchers and practitioners highlight the unreliability of travel as a potential weak link in the transportation system which may inhibit individuals' accessibility and urban economic activity. With the trend towards increasing traffic congestion, the outlook suggests that travel conditions will become structurally less reliable over time, but that not all places will be equally affected. But is travel time unreliability a problem? This study uses global positioning systems travel survey data for Chicago 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. Using the Chicago Metropolitan Agency for Planning (CMAP)'s 2007 Travel Tracker Survey, a household travel diary survey including both GPS and non-GPS components, we estimate a mode choice model for work trips to explore the influence of unreliability on travel behavior. The results suggest that unreliable auto travel conditions induce mode switching to transit and that the influence is strongest when service by train is already faster than by car. This further suggests that auto travel unreliability may have the strongest influence in metropolitan regions with highly-competitive transit systems. Nevertheless, the influence of travel unreliability is limited and is not the underlying driver of travel decision-making. Springer Science+Business Media, LLC., 2011 Chicago nationallicence Congestion nationallicence Mode choice nationallicence Transportation nationallicence Travel time unreliability nationallicence Sweet Matthias Department of City and Regional Planning, University of Pennsylvania, 127 Meyerson Hall, 210 South 34th Street, 19104, Philadelphia, PA, USA aut Chen Mengke Department of City and Regional Planning, University of Pennsylvania, 127 Meyerson Hall, 210 South 34th Street, 19104, Philadelphia, PA, USA aut Transportation Springer US; http://www.springer-ny.com 38/4(2011-07-01), 625-642 0049-4488 38:4<625 2011 38 11116 https://doi.org/10.1007/s11116-011-9335-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11116-011-9335-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sweet Matthias Department of City and Regional Planning, University of Pennsylvania, 127 Meyerson Hall, 210 South 34th Street, 19104, Philadelphia, PA, USA aut NATIONALLICENCE 700 1- Chen Mengke Department of City and Regional Planning, University of Pennsylvania, 127 Meyerson Hall, 210 South 34th Street, 19104, Philadelphia, PA, USA aut NATIONALLICENCE 773 0- Transportation Springer US; http://www.springer-ny.com 38/4(2011-07-01), 625-642 0049-4488 38:4<625 2011 38 11116 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer