Upload
orlando-estes
View
37
Download
0
Embed Size (px)
DESCRIPTION
LATENT DEMAND FORECAST MODEL FOR COLUMBUS PEDESTRIAN THOROUGHFARE PLAN. The Mid-Ohio Regional Planning Commission The 11th TRB National Transportation Planning Applications Conference May 9, 2007. Acknowledgements. City of Columbus Maricopa Association of Governments (MAG) - PowerPoint PPT Presentation
Citation preview
The Mid-Ohio Regional Planning Commission
The 11th TRB National Transportation Planning Applications Conference
May 9, 2007
1
City of Columbus
Maricopa Association of Governments (MAG)
Central Ohio Transit Authority
2
Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
3
Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
4
Identify major pedestrian network
Recognize pedestrian travel needs
Promote pedestrian activities
5
Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
6
“Gravity-based” Model
Non-linked vs. Linked
Latent Demand Score (LDS): 0~100%Relative levels of potential pedestrian travel demand among a given network
7
Both ends of walk trips
Attraction Production
8
P
P P P
P
P P P
AA
9
Distance matters
Source: MAG Pedestrian 2000-Technical Appendix, Dec 1999
P
P P P
P
P P P
Spatial queries
Buffer
10
AA
11
Attractor-base queries
Segment-based queries
12
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)
13
LDS - normalization 0 ~ 100%◦ Non-linked◦ Linked
Combine non-linked and linked trips
“Composite” LDS=MAX(non-linked LDS, Linked LDS)
14
Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
15
Grid System vs. TAZ Impact of Transit Service Additional Pedestrian “Attractors”
16
Regional Connections
17
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
18
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
19
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
20
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.
21
Government buildings, sport arena, museum, libraries, theaters, etc.
Four Categories◦ Service area (local vs. regional)◦ Service type (general vs. special)
22
23
Four Categories
24
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%
25
Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
26
27
28
29
30
Columbus Pedestrian Thoroughfare Plan Review of MAG Latent Demand Model MORPC’s Modification Results Conclusions
31
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
32
Ahmad Al-Akhras [email protected]
Chris Gawronski [email protected]
Anthony Hull [email protected]
Zhuojun Jiang [email protected]
33
34
Questions ? Questions ? Please use the Microphone.Please use the Microphone.