f is for fantastic ron milam
TRANSCRIPT
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New Directions in Transportation LOS -How to Avoid a Failing Grade
Presented byRonald T. Milam, AICP, PTP
CNU 17 – June 12, 2009
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Consequences of Current PracticeConsequences of Current Practice
Existing Conditions: LOS E
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Consequences of Current PracticeConsequences of Current Practice
Widening for LOS C• Longer crosswalks
• Loss of riparian habitat
• Increased impervious surface
• Higher vehicle speeds
• Greater consumption of physical space
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Relationship of Freeway LOS, Speed, and CO2 Emissions Factors
LOS, Speed, and Emissions
Relationship of Freeway LOS, Speed, and CO2 Emissions Factors
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Consequences
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Physical SpacePhysical Space
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Area dedicated to driving and parking = 21.5%
Early 20th Century
Physical Space – Design StandardsPhysical Space – Design Standards
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Area dedicated to driving and parking = 37.5%
Early 21st Century
Physical Space – Design StandardsPhysical Space – Design Standards
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Case Study: Davis, CACase Study: Davis, CA
Study Location
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Case Study: Davis, CACase Study: Davis, CA
• Alternative 1: Provide all pedestrian/bicycle signal phase• Alternative 2: Provide exclusive phase only for southbound (SB)
and westbound (WB) cyclists who travel on a Class I bicycle bath. Cyclists traveling on other approaches would travel with vehicles using the regular vehicle signal phase.
• Alternative 3: Traditional design (no exclusive bicycle and pedestrian phases)
• Alternative 4: Provide five-second “head-start” phase for SB and WB cyclists traveling on Class I bicycle path.
• Alternative 5: Provide grade-separated bicycle crossing connecting SB and WB Class I bicycle paths
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Case Study: Davis, CACase Study: Davis, CA
Seconds of person delay
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LOS Threshold Trade-offsLOS Threshold Trade-offs
Other ModesOther ModesOther ModesAir Quality/Climate ChangeAir Quality/Air Quality/Climate ChangeClimate Change
CostsCostsCostsTransit-OrientedDevelopmentTransitTransit--OrientedOrientedDevelopmentDevelopment Infill DevelopmentInfill DevelopmentInfill Development
Open SpaceOpen SpaceOpen Space
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Proximity vs. Speed
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• Early America
Proximity-Based Development
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• Post World War II
Speed-Based Development
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LOS, Speed, and Emissions
Relationship of Freeway LOS, Speed, and CO2 Emissions Factors
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LOS, Speed, and Emissions
Relationship of Arterial LOS, Speed, and CO2 Emissions Factors