VMT-based traffic impact assessment : development of a trip length model.
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2010-06-01
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Alternative Title:Vehicle miles of travel-based traffic impact assessment : development of a trip length model
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Edition:Final report; Apr. 2008-Mar. 2009.
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Abstract:This report develops models that relate the trip-lengths to the land-use characteristics at
the trip-ends (both production- and attraction-ends). Separate models were developed by trip
purpose. The results indicate several statistically significant and intuitively reasonable effects of
land-use patterns. High residential densities and a good mixing of complementary land-uses are
associated with shorter trips. Larger establishments attract longer trips and the HBO trip lengths
decrease with increased number of convenient-commercial land-use parcels in the neighborhood.
The connectivity provided by the roadway network and the urban-form of the area (measured in
terms of number of intersections and cul-de-sacs) also affect trip lengths. In addition to the local
land-use characteristics, the trip lengths also vary significantly by the location of the
neighborhood with the region. All these results hold even after controlling for several trip and
traveler characteristics.
Trip length models are applied within a regional, neighborhood and project context to
estimate trip lengths of a hypothetical development. Two simplified tools are presented that
utilize the proposed models within an Excel and Geographical Information System environment
that enable a user to estimate trip length as a metric of demand on the transportation network
from a proposed project.
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