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Joe BroachPhD Candidate, Urban Studies and Planning
Presented at the CTS Friday Transportation Seminar Series
October 31, 2014 in Portland, OR
photo: Jason McLaren
Trick or Treat(ment)?
Impact of Route-Level Features on Walk and Bike Decisions
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Photo by Oliver Smith
Google 2014October 31, 2014 CTS Friday Transportation Seminar, Portland, OR 2
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A little backstory
2007: BikeGPS study
Over 150 Volunteers with bike-mounted PDAs
2009-2011: Bike Model 1.0
Route choice model
2010-2013: Family Activity Study (FAS)
Over 1,000 adults and children, wearable GPS
2012-2015: Bike Model 2.0, Ped Model 1.0
Route and Mode Choice
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Why a new study?
1. Replication
2. Pedestrians
3. Sample
4. Network
5. Mode Choice
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New data
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Study Participants Multnomah County Families
w/ ChildrenMedian Annual
Household Income
$50,000-$75,000 $57, 143
%Female Adults 62.4% 58.7%
%Female Children 47.9% 49.0%%Married Couple
Families
58.5% 64.6%
%White, Non-Hispanic
Adults
84.9% 68.7%
%Four-year college
degree or higher
59.8% 37.5% (age 25+)
%Renters 19.2% 37.8%Vehicles per licensed
driver
0.98 -
Interested but
Concerned Cyclists
32% -
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Bike route choice
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1. “Label” alternatives
2. Calibrate detours
3. Terrain (LiDAR)
4. Traffic
5. Intersections
6. Facilities
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off-street path
bike boulevard
bike lane (>5k/day)
any street (>5k/day)
moderate (10-20k/day) traffic, no bike lane
heavy (20-30k/day) traffic, no bike lane
very heavy (30k/day) traffic, no bike lane
upslope 2-4%
upslope 4-6%
upslope 6%+bridge w/ path
bridge w/ bike lanestop sign
traffic signal
turn
crossing light (5-10k/day) traffic, no signal
crossing moderate (10-20k/day) traffic, no signalcrossing heavy (20k/day) traffic,
no signalleft turn across moderate
(10-20k/day) traffic, no signalleft turn across heavy (20k/day)
traffic, no signal
-120 -100 -80 -60 -40 -20 0 20 40 60 80 100
To compensate for listed feature, cyclist willing to ride...
FAS BikeGPS
% less % more
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Surprisingly consistent results
• Non-commute trips
• Female cyclists
• Facilities
• Slope
• Traffic
• Buffered lanes?
• Cycle tracks?
• Burnside Bridge?
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Some differences
• Commuting
• Traffic
• Bike lanes
• Delay
• Alleyways & Unpaved
streets
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Ped route choice
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• Alternatives: random
walks around the shortest
path
• Complex crossings
• Blockface land-use and
design
• Walking to destination or
transit
• 0.25 miles and up
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Attribute
Distance
Equivalent
Per additional…
turn +54 m
unsignalized arterial crossing +73 m
collector crossing w/o marked crosswalk+28 m
Change in perceived distance along…
ten percent upslope +99 %
unpaved or alley +51 %
busy street (collector or larger) +14 %
neighborhood commercial −28 %
Increase in detour cost…
traveling with another family member+85 %
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Compared with cyclists
• Facilities
• Intersections
• Wayfinding/Inertia
• Traffic
• Adjacent Land Use
• Detours
• And…traveling with
others?
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Stay tuned this Winter…
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Origin/Destination
Built Environment
Route-level
Built Environment
Tour Attributes
Route
Time/Cost
Walk/Bike
Route Choice
Walk/Bike
Networks
Shortest
Path
Motorized
Networks
Mode
Availability
Mode
Choice
Sociodemog.
Attitudes
Trip
Context
Presented
Today
Completed
Task
Coming
Soon!
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Application: crosswalk location
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50m
Bus
stop
Bus
stop
Model suggests
this crosswalk may
be too much of a
detour for peds.
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Biking the new bridge:
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Photo: M.O. Stevens (CC)
Tilikum Crossing’s cycling potential may be limited by
its steep grade (>4%).
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Some thanks are in order
• Jennifer Dill, John
Gliebe, dissertation
committee
• (O)TREC & Robert
Wood Johnson
• Metro & PBOT
• Geostats (Westat)
• Grad students
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