july 31, 2006 robert bertini sue ahn
DESCRIPTION
Using Archived Data to Measure Operational Benefits of a System-wide Adaptive Ramp Metering (SWARM) System Task 4: Pilot Study. July 31, 2006 Robert Bertini Sue Ahn. Presentation Outline. Work Plan – Progress Pilot Study Data Collected Data Analysis Results Remaining Task – TAC input - PowerPoint PPT PresentationTRANSCRIPT
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Using Archived Data to Measure Using Archived Data to Measure Operational Benefits of a System-wide Operational Benefits of a System-wide
Adaptive Ramp Metering (SWARM) Adaptive Ramp Metering (SWARM) SystemSystem
Task 4: Pilot StudyTask 4: Pilot Study
July 31, 2006July 31, 2006
Robert BertiniRobert Bertini
Sue AhnSue Ahn
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Presentation OutlinePresentation Outline
Work Plan – ProgressWork Plan – Progress Pilot StudyPilot Study
Data CollectedData Collected Data AnalysisData Analysis ResultsResults Remaining Task – TAC inputRemaining Task – TAC input
Recommendations for the Regional Recommendations for the Regional StudyStudy
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Work Plan - ProgressWork Plan - Progress
Task 1: Literature ReviewTask 1: Literature Review Report under revisionReport under revision
Task 2: Corridor SelectionTask 2: Corridor Selection Report under reviewReport under review
Task 3: Data Collection PlanTask 3: Data Collection Plan Report under reviewReport under review
Task 4: Pilot StudyTask 4: Pilot Study Freeway performanceFreeway performance On-ramp performance - ongoingOn-ramp performance - ongoing
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On-ramp Queue Storage: On-ramp Queue Storage: Morning Peak Hours (6:30-Morning Peak Hours (6:30-
8:30AM)8:30AM)
0
100
200
300
400
500
600
700
800
900
1000
Wils
hire
Wal
ker
B-H
Hw
y
Alle
n
Den
ney
Hal
l
Scho
lls-F
erry
Gre
enbu
rg
Paci
fic H
wy
72nd
On-ramps on ORE 217 southbound
Avg. h
ou
rly v
olu
me (
vph
)
0
200
400
600
800
1000
1200
1400
1600
1800
Qu
eu
e s
tora
ge (
ft)
Volume Queue storage
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On-ramp Queue Storage: On-ramp Queue Storage: Morning Peak Hours (4:30-Morning Peak Hours (4:30-
6:30PM)6:30PM)
0
100
200
300
400
500
600
700
800
900
1000
Wils
hire
Wal
ker
B-H
Hw
y
Alle
n
Den
ney
Hal
l
Scho
lls-F
erry
Gre
enbu
rg
Paci
fic H
wy
72nd
On-ramps on ORE 217 southbound
Avg. h
ou
rly v
olu
me (
vph
)
0
200
400
600
800
1000
1200
1400
1600
1800
Qu
eu
e s
tora
ge (
ft)
Volume Queue storage
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Pilot Study: Data CollectionPilot Study: Data Collection
Location of On-rampsMeter: Outflows (Merging Rate)
Entrance: Inflows
Barnes Rd. / US26W Loop
US 26E Road tube CCTV camera
Wilshire Rd. Loop Road tube, Portable camera
Walker Rd. Loop CCTV camera
B-H Hwy LoopCCTV camera, Portable
camera
Allen Blvd. Loop CCTV camera
Denney Rd. Loop CCTV camera
Hall Blvd. Loop Road tube, Portable camera
Scholls-Ferry Rd. LoopCCTV camera, Portable
camera
Greenburg Rd. Loop CCTV camera
Pacific Hwy Loop CCTV camera
72nd Ave. Loop CCTV camera
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Pilot Study: Data CollectionPilot Study: Data Collection
Pre-timed: June 19 – 23, 2006Pre-timed: June 19 – 23, 2006 SWARM: June 26 – 30, 2006SWARM: June 26 – 30, 2006
Accidents: June 21 and June 30 Accidents: June 21 and June 30 (excluded from analysis)(excluded from analysis)
Weather: Comparable (high Weather: Comparable (high temperature on the 2temperature on the 2ndnd week) week)
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Pilot Study: Data AnalysisPilot Study: Data Analysis
Data Quality: Communication FailuresData Quality: Communication Failures Freeway: VMT, VHT, Travel Time, Freeway: VMT, VHT, Travel Time,
DelayDelay On-ramps: Queue spill-overOn-ramps: Queue spill-over
FrequencyFrequency DurationsDurations Total delay: on-going Total delay: on-going Challenge Challenge
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Communication FailuresCommunication Failures
0%
2%
4%
6%
8%
10%
12%
14%
16%
Bar
nes
Rd.
Wils
hire
Rd.
Wal
ker
Rd.
B-H
Hw
y
Alle
n B
lvd.
Den
ney
Rd.
Hal
l Blv
d.
Scho
lls-F
erry
Rd.
Gre
enbu
rg R
d.
Paci
fic H
wy
On-ramps on ORE 217 southbound
% C
om
munic
ati
on f
ailure
s Pre-timed
SWARM
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Performance Measures (6-Performance Measures (6-9AM)9AM)
VMT VHTTravel-Time
(minutes)
Delay (veh-hrs)
Pre-Timed 65,871 1,337 8.8 210
SWARM 66,426 1,416 9.2 283
% Change 0.8% 6.0% 5.1% 34.7%
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What happened??What happened??
SWARM is not operating optimally SWARM is not operating optimally Parameters need to be fine-tunedParameters need to be fine-tuned Effect of communication failuresEffect of communication failures Smaller discharge rate from the Smaller discharge rate from the
bottleneckbottleneck Larger freeway delay but smaller Larger freeway delay but smaller
system-wide delaysystem-wide delay Larger inflow from the on-rampsLarger inflow from the on-ramps Short pilot study duration: The results Short pilot study duration: The results
are not statistically significant.are not statistically significant.
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Delay (Pre-timed)Delay (Pre-timed)
Travel Direction
Diff
ere
nce
in d
ela
y (
vehic
le-h
ours
)
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Delay (SWARM)Delay (SWARM)
Travel Direction
Diff
ere
nce
in d
ela
y (
vehic
le-h
ours
)
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Change in Delay Change in Delay (SWARM – Pre-timed) (SWARM – Pre-timed)
Travel Direction
Diff
ere
nce
in d
ela
y (
vehic
le-h
ours
)
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Change in DelayChange in Delay
0
10
20
30
40
50
60
70
Barnes
Wilshire
Walker
Bhhwy
Allen
Denney Ha
ll
Scholls
Greenburg
99W
Pre-timed
SWARM
Dela
y (
veh-h
rs)
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On-ramp Volumes: On-ramp Volumes: Morning Peak Hours (6:30-Morning Peak Hours (6:30-
8:30AM)8:30AM)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Barn
es
Wils
hire
Wal
ker
B-H
Hw
y
Alle
n
Den
ney
Hal
l
Scho
lls-
Ferr
y
Gre
enbu
rg
Paci
fic H
wy
On-ramps on ORE 217 Southbound
On-r
am
p v
olu
me (
vehic
les)
Pre-timed
SWARM
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Pilot Study: Queue Spill-overPilot Study: Queue Spill-over
Location of On-ramps
Pre-timed SWARM
Walker Rd. No spill-over No spill-over
B-H Hwy Spill-over No spill-over
Allen Blvd. No spill-over No spill-over
Denney Rd. No spill-over No spill-over
Hall Blvd. No spill-over No spill-over
Scholls-Ferry Rd. No spill-over Spill-over
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Pilot Study: Queue Spill-overPilot Study: Queue Spill-over
Location of On-ramps
Pre-timed SWARM
Walker Rd. No spill-over No spill-over
B-H Hwy Spill-over No spill-over
Allen Blvd. No spill-over No spill-over
Denney Rd. No spill-over No spill-over
Hall Blvd. No spill-over No spill-over
Scholls-Ferry Rd. No spill-over Spill-over
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Pilot Study: Queue Spill-overPilot Study: Queue Spill-over
Total DurationFrequen
cyAvg. Duration
Pre-timed
25.2 mins 12 2.1 mins
SWARM 43.1 mins 9 5.0 mins
Scholls-Ferry Rd.
Total DurationFrequen
cyAvg. Duration
Pre-timed
11-12 mins (on 19th 22nd)
1 11-12 mins
SWARM 0 0 0
Beaverton-Hillsdale Highway
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Next StepsNext Steps
Reasons for the increase in delayReasons for the increase in delay More analysis on on-rampsMore analysis on on-ramps
Total delay? – require counts at metersTotal delay? – require counts at meters Travel time (sampling frequency)Travel time (sampling frequency)
ReportReport
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RecommendationsRecommendations
Data near bottleneck to measure Data near bottleneck to measure bottleneck discharge flowbottleneck discharge flow
Agree on performance measure for Agree on performance measure for on-rampson-ramps Total delay, queue length, queue spill-Total delay, queue length, queue spill-
overover All or selected on-rampsAll or selected on-ramps
Data collection method for on-rampsData collection method for on-ramps Video: time-consuming for total delayVideo: time-consuming for total delay