SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY

Measuring Route-Level Accessibility: Applications to San

Francisco Network

Jennifer Ziebarth, Neema Nasir,Elizabeth Sall, Lisa Zorn

TRB Planning Applications ConferenceMay 9, 2013

SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY

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Route-level accessibility

Many paths One path

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Creating a bicycle route choice model

Hood, Sall, Charlton: “A GPS-based bicycle route choice model for San Francisco, California”. Transportation Letters (2011) 3: (63-75).

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Route-level accessibility from Ferry Building

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If we build it … they will run away??

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Routes are correlated with each other

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It all comes down to the pathsize correction

Path utility Pathsize correction

Before After Before After

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Valencia paradox

Before After

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Bierlaire and Frejinger

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Pathsize Penalty algorithm

Path 1 Path 3Path 2

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Sensitivity testing, revisited

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One path versus many

1 path 5 paths 10 paths

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Thank you!

Special thanks to:Elizabeth Sall, Lisa Zorn, Neema Nassir,

Jeff Hood, John Bowman,Dan Tischler, Alireza Khani