the mid-ohio regional planning commission the 11th trb national transportation planning applications...
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The Mid-Ohio Regional Planning Commission
The 11th TRB National Transportation Planning Applications Conference
May 9, 2007
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City of Columbus
Maricopa Association of Governments (MAG)
Central Ohio Transit Authority
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Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
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Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
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Identify major pedestrian network
Recognize pedestrian travel needs
Promote pedestrian activities
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Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
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“Gravity-based” Model
Non-linked vs. Linked
Latent Demand Score (LDS): 0~100%Relative levels of potential pedestrian travel demand among a given network
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Both ends of walk trips
Attraction Production
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P
P P P
P
P P P
AA
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Distance matters
Source: MAG Pedestrian 2000-Technical Appendix, Dec 1999
P
P P P
P
P P P
Spatial queries
Buffer
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AA
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Attractor-base queries
Segment-based queries
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Attractor-base queries
Segment-based queries
Non-linked trips: entire trip made by foot◦ Work (college/University)◦ Shopping and Errands◦ School◦ Recreational
Linked trips: partial trip made by foot (most of the trip made by auto/other motorized modes)
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LDS - normalization 0 ~ 100%◦ Non-linked◦ Linked
Combine non-linked and linked trips
“Composite” LDS=MAX(non-linked LDS, Linked LDS)
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Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
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Grid System vs. TAZ Impact of Transit Service Additional Pedestrian “Attractors”
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Regional Connections
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TAZ Grid
MAG linked pedestrian tripsLinked LDS = E/A• E=total employment within the buffer• A=total area within the buffer
Attraction (employment) end vs. production (residence) end
Auto vs. Transit
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Revised linked pedestrian tripsLinked LDS = (Pb%+E)/A• P=total population within the buffer• b%=transit share of trips by the population• E=total employment within the buffer• A=total area within the buffer
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Transit Share – b%◦ Mode split information at Block Group (BG) level from
Census 2000 SF3 data◦ Mode split information at Grid level?
◦ Transit Service Frequency by Route at Grid level from Central Ohio Transit Authority (COTA) Stops in the Grid Headways
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Transit Share – b% (cont’d)
b%=M% (f / F)• M%= max. BG transit share within the entire
region considered.• f= transit service frequency within Grid/its
buffer.• F=max. transit service frequency within Grid/its
buffer.
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Government buildings, sport arena, museum, libraries, theaters, etc.
Four Categories◦ Service area (local vs. regional)◦ Service type (general vs. special)
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Four Categories
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Weight Score
Example of weighting factor◦ Library and Fairground in the buffer of a segment with
LDS = 80%
Weight score = 3+1=4Weighting factor = 1.04 (multiplicative)
New LDS = 80% 1.04= 83.2%
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Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
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Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
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Understanding pedestrian travel demand Evaluating existing sidewalk system (ongoing) Prioritizing pedestrian facility improvements in a
consistent way
Future work: refine methodologies and update the results periodically
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Ahmad Al-Akhras [email protected]
Chris Gawronski [email protected]
Anthony Hull [email protected]
Zhuojun Jiang [email protected]
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Questions ? Questions ? Please use the Microphone.Please use the Microphone.