Grand Ave & Duff Ave Craig & James CE 550 4/18/2007.
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Transcript of Grand Ave & Duff Ave Craig & James CE 550 4/18/2007.
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Grand Ave & Duff Ave
Craig
&
James
CE 550
4/18/2007
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Problem Statement
Grand Ave/Duff Ave intersection is on the northeast part of Ames, with 36,600 vehicles entering the intersection each day.
Figure 1 Grand Ave/Duff Ave Interesection
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Problem Statement (Cont’) There were 33 crashes
in this intersection during 2001~2005 period. Figure2 shows the summary of these crashes. The average property damage is $4,214.
Crash Summary
Unknow n12%
Property Damage Only
73%
Minor Injury9%
Major Injury6%
Fatal0%
Figure 2
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Figure 3
Problem Statement (Cont’) ‘Ran Traffic Signal’ and ‘Making Left Turn’
are the two major causes, which take about 79% of the total crashes.
Major Cause Summary(2001~2005)
02468
10121416
Ran Traffic Signal Making Left Turn Made ImproperTurn
Other Unknown
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Problem Statement (Cont’) It is surprised to
discover that ALL the crashes by last 5 years are related to alcohol.
Figure 4
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’Making Left Turn’ Crashes
As there is no left-turn protected traffic lights in this intersection, usually the left-turn vehicles on the Grand Ave will pull upward a little bit to make an easy left-turn. This is the typical situation when a crash will happen.
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One Crash in June 2002
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Possible Solutions Majority – Left-turn incidents Garber & Hoel
Create one-way streetWiden roadProvide left-turn signal phaseProhibit left turnsReroute left-turn trafficChannelize intersectionRevise Signal Sequence
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Possible Solutions
Traffic SignalsRetime Signals
Increase amber phase Longer all-red phase
Advanced Warning
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Recommended Solution
Left-turn Incidents Grand Ave
Majority of IncidentsProtected left-turn only
Duff AveTurning bays for left-turnProtected left-turn only
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Recommended Solutions
Traffic signals
Retime signals
Collect data on signal sequence
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References Crash Mapping Analysis Tool, Version 3.6.0. Developed
by Center for Transportation Research and Education at Iowa State University. PI: Dr. Reg Souleyrette. Lead Software Developer: Nick Burdine. Copyright 2002-2005.
Crash Report Diagrams and Narratives. Prepared for use by the Iowa Department of Transportation, Office of Traffic Safety.
Iowa’s GIS-SAVER:E5. Iowa Department of Transportation, Office of Traffic Safety. Dr. Michael D. Pawlovich.
Garber and Hoel. Traffic and Highway Engineering, 3rd edition. 2002.
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Questions ??
Thank you. ☺