Urban public transit systems modeling capabilities
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1995-02-01
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TRIS Online Accession Number:00677879
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OCLC Number:32484251
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NTL Classification:NTL-PUBLIC TRANSPORTATION-Transit Planning and Policy
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Abstract:Current national transportation policy places increasing emphasis on multi-modal
solutions involving public transit and high-occupancy vehicle (HOV) facilities
and services. Current traffic simulation/assignment models, however, have only
limited capabilities for evaluating the fuel consumption, traffic, and
environmental impacts of alternative transit and HOV facilities and services in
a multimodal transportation system. Therefore, a formal assessment of current
transit and HOV modeling capabilities was conducted, with emphasis on CORFLO,
which is uniquely suited among U.S. public-domain models for detailed evaluations
of traffic conditions in urban corridors. Other models assessed include CONTRAM,
INTEGRATION, JAM, TATM, MICRO ASSIGNMENT, NETSIM, SATURN, TRAFFICQ, and TRANSYT.
SATURN and CORFLO were teh most highly rated with respect to their modeling
approach, transit and HOV supply/demand modeling, and output measures of
effectiveness. A detailed analysis of CORFLO's logic and code and a case study
evaluation of transit and HOV alternatives using a CORFLO model of the North
Central Expressway Corridor in Dallas, Texas, revealed several areas in which
CORFLO should be enhanced to improve its urban public transit systems modeling
capabilites. Recommended enhancements include increasing the number of bus
stops that can be accommodated, refining the modeling of bus movements along
links, and adding or improving fuel consumption and emissions algorithms. These
enhancements are necessary in order to estimate with reasonable accuracy the
fuel consumption, traffic, and environmental impacts of common transit and HOV
alternatives.
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