Pedestrian Responsive Signal Timing Strategies
Development of Pedestrian
Responsive Signal Timing
Strategies: Results from a Pilot
Study in Portland, OR.
July 15th, 2013
Presenter:
Sirisha Kothuri
[email protected]
Co-authors:
Titus Reynolds
Christopher Monsere
Peter Koonce
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Pedestrian Responsive Signal Timing Strategies
Outline

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

Goals
Background
Study Locations
Data Collection
Results
Conclusions
Future Work
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Pedestrian Responsive Signal Timing Strategies
Goals
 Pilot study to explore and test strategies to
reduce pedestrian delay at signalized
intersections
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Introduction
 Growing emphasis on active transportation
 Increase in walk trips
 18 billion (1990)
42.5 billion (2009)
Source: Climate Action Plan, City of Portland
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Background - I
 Lack of pedestrian data
 Signal Timing
 Vehicle centric
 Regional policies
 Delay
 Important performance measure
 Pedestrians largely ignored
 Relationship with non-compliance
Goals | Background | Locations | Data | Results | Conclusions | Future Work
Source: Portland Transportation System Plan
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Pedestrian Responsive Signal Timing Strategies
Background - II
 HCM equation for ped delay

.  C = cycle length, g = ped effective green
 Ignores the effect of other parameters
 Ped override mode
 Permissive length
 No studies on effects of mode of operation
 Coordinated vs. free
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Pilot Study Locations
 Criteria
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Goals | Background | Locations | Data| Results | Conclusions | Future Work
2070 controller
Delay logic
Type of control
Ped demand
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Pedestrian Responsive Signal Timing Strategies
33rd Ave
Pilot Study Locations – Half Signal
Hancock St
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
16th Ave
Pilot Study Locations – Full Signal
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Data Collection
Base
Scenario 1
Scenario 2
Scenario 3
Scenario 4
Half
• Coordinated • Coordinated • Coordinated • Coordinated • Free
• PL – 19 sec • PL – 28 sec • PL – 35 sec • PL – 19 sec
(peak)
• PL – 35 sec
(off-peak)
Full
• Coordinated • Coordinated
(peak only)
• Free
(off-peak)
___
Goals | Background | Locations | Data | Results | Conclusions | Future Work
___
___
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Pedestrian Responsive Signal Timing Strategies
Data Collection
 Voyage software
 Internal logic commands
 Ped delay
 Discrete
 Binned
 Ped actuations
Date
Time
7/12/2011
17:57:38
Transit
Priority
2
7/12/2011
17:58:29
2
7/12/2011
17:58:29
2
Status
TP Input Active
TP Phases
Achieved
TP Input Went
Inactive In TP
Green
Phases
Active
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Coord
Plan
3
Cycle
Length
80
On
Green
Off
33
0
0
48
3
80
33
4
0
48
3
80
33
4
4
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Data Collection
portal.its.pdx.edu
demo.portal.its.pdx.edu
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Permissive Length
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Permissive Length Changes
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Statistics
• p = 0.002
• Base*
• Scenario 1**, Scenario
2**, Scenario 3**
•
•
•
•
p = 0.000
Base*
Scenario 1**, Scenario 3**
Scenario 2***
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Cycle Length Impacts
Average Ped Delay (s)
35
30
Base
Scenario 1
25
Scenario 2
20
Scenario 3
HCM Delay
15
10
60
70
80
90
100
Cycle Length (s)
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Data
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Operation Mode Changes
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Conclusions
 Role of walking
 Pedestrian delay reduction
 Mode of operation
 Permissive length
 Limitation
 Vehicular delay not considered
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Future Work
 Incorporate vehicle delays via simulation
 Quantify delays for different strategies
 Guidance on strategies based on
 Vehicular volume
 Ped volume
 Pedestrian survey at intersections
 Understand crossing behavior
Goals | Background | Locations | Data | Results | Conclusions | Future Work
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Pedestrian Responsive Signal Timing Strategies
Thank you!
Sirisha Kothuri
[email protected]
Titus Reynolds
[email protected]
Dr. Christopher Monsere
[email protected]
Peter Koonce
[email protected]
http://portal.its.pdx.edu/
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