Transcript I-80/Yerba Buena Island Interchange Improvement Project

Making Activity-Based Travel
Demand Models Play Nice With Trip
Rates
Elizabeth Sall, Daniel Wu, Billy Charlton
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
TRB Planning Applications Conference – Reno, NV
May 2011
Objective
Develop a lookup table for auto vehicle trip ends by
land use square footage that accounts for accessibility.
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
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Possibilities ?
SF-CHAMP
SF Observed
Data
poof!
Validated
Uniqueness of SF
pow
“The Ds” and transit system
Currently on the ground
meh
Future changes to “the Ds”
and transit system
Easy to get trip rates by
specific Land Use Category
pow
pow
pow
pow
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
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Trip Rates!?!?…but there’s so much that goes into
determining if a trip is made!!!
Are they a worker?
Are they a student?
How many jobs?
Are they part time?
What is their income?
How old are they?
Do they have a car?
Do they have a license?
Do they have kids?
Are they a woman?
How many workers are in the household?
How many cars per worker?
What is their accessibility to all destinations from home
considering the cars per worker in their household?
What is their accessibility to work or school considering
the cars per worker in their household?
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
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By Land Use Category!?!?
 Can’t distinguish which job actually pulled that trip into
the TAZ – all part of a size term.
 Different size terms for:
 Trip purpose
 Primary destinations versus intermediate stops
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
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Reverse-Engineering the AB Model to ‘make it simple’
 Multiple linear regression on model results:
 Vehicle Trip Ends for zone z =
B * Households +
B * Cultural/Institutional Employees +
B * Medical Employees +
B * Office Employees +
B * PDR Employees +
B * Visitor/Hotel Employees +
B * Retail Employees
 Segment regressions based on simple accessibility
groupings.
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
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Accessibility Variables
Requirements:
 Encourage development consistent with San
Francisco’s “transit first” policy
 Simple to calculate or look up on a map
 Account for wide variations in vehicle trip rates across
the city
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
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Accessibility Variables Considered
 Transit Intensity (combined headways)
 Employment Density
 Household Density
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“Accessibility Zone” Map
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Final Auto Vehicle Trip Rates
Accessibility Adjustments
BASE/LOW
HHLDS
7.5
CIE
7.3
MED
4.7
RET
10.5
VIS
7.9
PDR
6.0
MIPS
1.9
MEDIUM
HIGH
-3.0
-3.5
-3.0
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
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Questions?
[email protected]
Special Thanks:
Viktoriya Wise, Stephen Newhouse, Dan Wu & Rachel Hiatt
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
AUTO TRIP MITIGATION FEE // MAPS & CORR
Scenarios
A
ZONE 1: Within ½ mi of Rapid Transit*
ZONE 2: Within ½ mi of Other Transit**
ZONE 3: All Else
B
ZONE 1: Within ¼ mi of Rapid Transit
ZONE 2: Within ¼ mi of Other Transit
ZONE 3: All Else
C
ZONE 1: Within ½ mi of Rapid Transit
ZONE 2: Within ¼ mi of Other Transit
ZONE 3: All Else
* Rapid Transit includes BART and the “Rapid Network” as defined by MUNI (All rail plus major bus routes)
** Other Transit includes any other transit stop
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
AUTO TRIP MITIGATION FEE // MAPS & CORR
Scenarios
E
ZONE 1: Within ½ mi of Rail (BART or MUNI)
ZONE 2: Within ½ mi of Other Transit
ZONE 3: All Else
F
ZONE 1: Within ¼ mi of Rail
ZONE 2: Within ¼ mi of Other Transit
ZONE 3: All Else
G
ZONE 1: Within ½ mi of Rail
ZONE 2: Within ¼ mi of Other Transit
ZONE 3: All Else
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
Transit Intensity Calculation
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Thresholds Used
TRANSIT
HIGH
LOW
Combined
Headway of all
routes with
stops within ¼
mi <=1 min
Combined
Headway of all
routes with
stops within ¼
mi >1 min
EMPLOYMENT >= 50 jobs/acre < 50 jobs/acre
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SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
TRANSIT INTENSITY (Detail)
< = 1 min
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
> 1 min
EMPLOYMENT DENSITY (Detail)
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
HOUSEHOLD DENSITY (Detail)
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
ZONE MAP
Combines transit intensity, employment density, and household density
into eight zones.
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
ZONE MAP (Detail)
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY