Murray Boulevard and Farmington Road Intersection
description
Transcript of Murray Boulevard and Farmington Road Intersection
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Murray Boulevard and Farmington Road
Intersection
Sirisha Kothuri
Wei Feng
Ping Guo
Meead Saberi
CEE 550 Transportation Safety Analysis
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Outline• Introduction
• Site Description
• Crash Data Analysis
• Literature Review
• Countermeasures
• Cost/Benefit Analysis
• Recommendations
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Introduction
Map of Intersection
Murray Boulevard• 2 lane undivided• Runs N-S
Farmington Road• 2 lane undivided • Runs E-W
Intersection• City of Beaverton • 4-leg signalized• Slight skew• High Volume
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Aerial View of the Intersection
Site Description - I
Murray Blvd
Farmington Road
Apt7-Eleven
AptOff
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Site Description - II
Signal at Intersection Illumination at Intersection
Barrier at Intersection Pavement Markings at Intersection
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Site Description - III
Speed Limit Sign on Farmington Speed Limit Sign on Murray
Driveways near Intersection School Zone Signs
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Site Description - IV
Heavy Vehicles
Queue Spillover to Adjacent Intersection
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Volume
Source: City of Beaverton
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Crash Data Analysis
Oregon Transportation Safety Data Archive (ortsda)• Crash File
• Crashes for 4 Years (2003 -2006) at intersection
• Vehicle File• Information about vehicles involved in crashes at intersection
• Participant File• Information about drivers involved in crashes at intersection
Crash Patterns at the Intersection • Time of Day• Type of Crash• Severity• Weather• Light Conditions
Driver Characteristics• Residence Status• Gender• Age
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Time of the day
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Time of Day
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Type of Crash
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Severity
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Crash Cause
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Collision Diagram
Murray Blvd
Farmington Rd
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Literature Review
Rear End Crashes– Most common type at signalized intersections– Account for one-third of all reported crashes in US– Mostly PDO, sometimes severe injuries and fatalities occur
Causes– Driver Behavior – Inattentive driving, smaller headways– Driver Age and Gender– Heavy Traffic Volumes– Dilemma Zone
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Dilemma (Indecision) Zone
Source: Heng Wei, Characterize Dynamic Dilemma Zone and Minimize its Effect at Signalized Intersections, Ohio Transportation Consortium (OTC),
2008
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Dilemma (Indecision) Zone
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Countermeasures
1. Reduce speed limit on approaches to
• 35 mph on Murray Blvd• 30 on Farmington Road
Pros• Reduction in all types of crashes
Cons• Increase in delay• Diversion of vehicles to other streets
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Countermeasures
2. Advance Signal Warning Signs
• Murray Blvd & Farmington Rd
Pros• Reduction in Rear End Crashes• Low cost• Easy Implementation
Cons• Need space?
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Countermeasures3. Improve Signal Timing
• Optimize to ITE Standards
Pros• Reduces Rear End PDO crashes
Cons• Increases Fatal and Injury crashes?!
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Countermeasures4. Coordinated Signals
• Coordinate adjacent intersections
Pros• Allows progression of vehicles• Reduces all types of crashes
Cons• Hard to implement
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Cost Benefit Analysis
Select Countermeasures– For each countermeasure, extract CRF– Calculate reduction in crashes– Calculate annual benefits and costs– Assume discount rate of 4%– Calculate NPV = NPVB – NPVC– Rank countermeasures in decreasing order of NPV
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Cost Benefit Analysis
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
PDO INJC INJB INJA FATAL
Crash Type
Co
st (
$)
Cost of All Crashes at Intersection (4 years)
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Cost Benefit Analysis
1. Reduce vehicle’s approach speed limit
0
50000
100000
150000
200000
250000
300000
350000
PDO INJC INJB INJA FATAL
Crash Type
Cra
sh
Co
st
($/y
ea
r)
Before
After
$44,688
$76,875
$10,250
$42,937 $43,062
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Cost Benefit Analysis
2. Advance Signal Warning Signs
0
50000
100000
150000
200000
250000
300000
350000
400000
PDO INJ FATAL
Crash Type
Cra
sh
Co
st
($/y
ea
r)
Before
After
$40,950
$121,770
$62,010
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Conclusions & Recommendations
Rear-end crashes are common at signalized intersections.
Typical causes• Driver Behavior• Driver Age & Gender• Heavy Traffic Volumes• Dilemma Zone
Countermeasures Ranking Based on B/C Analysis1. Install Advance Signal Warning Signs2. Reduce vehicle’s approach speed limit3. Signal Coordination
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Acknowledgements
Dr. Chris Monsere, PSU
Jabra Khasho, City of Beaverton
Baotu Ho, City of Beaverton