Incorporating Greenhouse Gas Considerations Incorporating Greenhouse Gas Considerations in RTP Modeling in RTP Modeling Jerry Walters, Fehr & Peers Jerry Walters, Fehr & Peers CTC Work Group Meeting on CTC Work Group Meeting on RTP Guidelines RTP Guidelines June 28, 2007 June 28, 2007
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Incorporating Greenhouse Gas Considerations in RTP Modeling Jerry Walters, Fehr & Peers CTC Work Group Meeting on RTP Guidelines June 28, 2007.
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Incorporating Greenhouse Gas Considerations in Incorporating Greenhouse Gas Considerations in RTP ModelingRTP Modeling
Jerry Walters, Fehr & PeersJerry Walters, Fehr & Peers
CTC Work Group Meeting on CTC Work Group Meeting on RTP GuidelinesRTP Guidelines June 28, 2007June 28, 2007
Linkages between RTP and GHGLinkages between RTP and GHG
Land Use and Transportation
Policies
Land Use
Transportation Nets
Built Environment
TDM
Vehicle Miles Vehicle Trips
Vehicle Speeds
CO2 Emissions Other GHG
Global Warming
Linkage 1. 4D Relationships between Travel and Built Environment
Destinations (accessibility to regional activities)
Development at infill or close-in locations reduces Development at infill or close-in locations reduces vehicle trips and milesvehicle trips and miles
Transit shares higher within ¼ mile and ½ mile of station
Distance to Transit
Vehicle Trips
Per Capita
VMT
per Capita
Density 4% to 12% 1% to 17%
Diversity 1% to 11% 1% to 13%
Design 2% to 5% 2% to 13%
Destinations 5% to 29% 20% to 51%
4D Elasticity Ranges
Sources: National Syntheses, Twin Cities, Sacramento, Holtzclaw
Land Use Clustering, Mixing, Traditional Land Use Clustering, Mixing, Traditional Neighborhood Design – All Reduce TravelNeighborhood Design – All Reduce Travel
Why it matters: 55% to 65% of trips are less than 3 miles. Up to 80% are less than 5 miles.
Shortcomings of Conventional Travel Models Shortcomings of Conventional Travel Models in Assessing Smart Growthin Assessing Smart Growth
• Primary use is to forecast long-distance auto travel on Primary use is to forecast long-distance auto travel on freeways and major roadsfreeways and major roads
• Secondary use is to forecast system-level transit useSecondary use is to forecast system-level transit use
• Short-distance travel, local roads, non-motorized travel Short-distance travel, local roads, non-motorized travel modes are not addressed in model validationmodes are not addressed in model validation
Typical Model “Blind Spots”Typical Model “Blind Spots”
• Abstract consideration of distances between land uses within a given TAZ or among neighboring TAZ’s
• Limited or no consideration intra-zonal or neighbor-zone transit connections
Network in ModelNetwork in Model Network in FieldNetwork in Field
Typical Model “Blind Spots”Typical Model “Blind Spots”
• Sidewalk completeness, route directness, block Sidewalk completeness, route directness, block size generally not considered.size generally not considered.
Typical Model “Blind Spots”Typical Model “Blind Spots”
• Little consideration is given to spatial relationship Little consideration is given to spatial relationship between land uses within a given TAZ (density)between land uses within a given TAZ (density)
• Interactions between different non-residential land Interactions between different non-residential land uses (e.g. offices and restaurants) not well uses (e.g. offices and restaurants) not well representedrepresented
Potential Sources of SolutionsPotential Sources of Solutions
• Assessment of Local Models and Tools for Analyzing Smart-Growth Strategies (Caltrans)
• Urban Development, VMT and CO2 Emissions, (Smart Growth America)
• Smart Growth INDEX (EPA)
• Travel Characteristics of TOD in California (Caltrans/ Lund, Cervero, Willson)
Caltrans Study ConclusionsCaltrans Study Conclusions
Assessment of Local Models and Tools for Analyzing Smart-Growth Strategies
High-Sensitivity Models
Moderate-Sensitivity Models
Low-Sensitivity Models
Steps to Improve UTMS Sensitivity to Smart-Growth Strategies
Tra
vel
Tim
e F
ee
db
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ork
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As
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Su
pp
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Dem
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Inte
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La
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/Tra
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Mo
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Ac
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Ex
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Deg
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mart
-Gro
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Str
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Mo
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Dis
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Caltrans Study RecommendationCaltrans Study Recommendation
Assessment of Local Models and Tools for Analyzing Smart-Growth Strategies
Use 4D’s to compensate for any lack of sensitivity in presiding model.
2 Induced Investment Development, Travel
Average VMT Elasticities to Added CapacityAverage VMT Elasticities to Added Capacity
Facility-Specific Studies
Areawide Studies
Short-Term 0 0.4
Medium-Term 0.27 NA
Long-Term 0.63 0.73
Integrated Land Use/ Transportation ModelsIntegrated Land Use/ Transportation Models