USING PeMS DATA TO EMPIRICALLY DIAGNOSE FREEWAY BOTTLENECK LOCATIONS IN ORANGE COUNTY, CALIFORNIA Robert L. Bertini Portland State University Aaron M. Myton Oregon Department of Transportation TRB 84 th Annual Meeting Washington D.C. January 9-13, 2005
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USING PeMS DATA TO EMPIRICALLY DIAGNOSE FREEWAY BOTTLENECK LOCATIONS IN ORANGE COUNTY, CALIFORNIA Robert L. Bertini Portland State University Aaron M.
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USING PeMS DATA TO EMPIRICALLY DIAGNOSE FREEWAY BOTTLENECK LOCATIONS
IN ORANGE COUNTY, CALIFORNIA
Robert L. BertiniPortland State University
Aaron M. MytonOregon Department of
Transportation
TRB 84th Annual Meeting
Washington D.C.
January 9-13, 2005
Objectives
• Identify Freeflow Congested Conditions
• Determine Bottleneck Locations
• Measure Queue Discharge Features
• Conclusions
• Foundation for Understanding Freeway Operations
• Queues Cause Delays
• Loop Detectors Good Data Source
• Previous Studies– Throughput Increase 2-5% Prior To Queue
– Diverge Bottleneck Identified
• PeMS Provides Opportunity for Detailed Data Analysis
Background
Cul
ver D
r.
Uni
vers
ity D
r.
Sand
Can
yon
Ave
.
Hw
y. 1
33
Irvin
e C
ente
r Dr.
Trav
el D
irect
ion
130
110
100
90 80 70 60 50 40 30 20 10
Site Map Loop DetectorStation Number
L E G E N D
110
120
• Four Northbound Lanes
• One Northbound HOV Lane
• Freeway Ramps Between Stations, Except 100/110
140
N
Post-mile
Bottleneck Definition
Queued Unqueued
Bottleneck
D e te c to rs
• Queue upstream
• Freely-flowing traffic downstream
• Temporally and spatially variable
Data• Freeway Performance Monitoring System (PeMS)
• Ten Queues Formed at Five Locations• Flow Reduction of 3-15%• No Queue in HOV Lanes• Bottlenecks Typically Activated Near Ramps• No Speed Threshold Needed
Future Research
• Study site on different days• Manual replication of procedure• Develop semi-automated method
Acknowledgements• Prof. Pravin Varaiya and Prof. Alexander
Skabardonis, U.C. Berkeley• Dr. Karl Petty, Berkeley Transportation Systems• Pherak Hay, Vu Mai, and Roger Lindgren
Station 50, Occupancy
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Time
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up
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Station 40, Occupancy
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