transportation impact analysis presented by katy flynn, p.e. fehr & peers february 19, 2008
TRANSCRIPT
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Transportation Impact Analysis
Presented By
Katy Flynn, P.E.
Fehr & Peers
February 19, 2008
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Presentation Overview
• What is a Transportation Impact Analysis?• Why do we prepare Transportation Impact
Analyses?• How do we prepare a Transportation Impact
Analysis?
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What is a Transportation Impact Analysis (TIA)?
A Transportation Impact Analysis evaluates
the impacts of a proposed project on the surrounding transportation system
and identifies measures to mitigate significant impacts.
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Why Do We Prepare TIAs?• Evaluate Project Impacts • Agency Requirements
• Criteria – Project meets a trip threshold (for Washoe County the Threshold is 80 or more trips during the peak hour or 750 or more on a daily basis), controversial project, nearby intersections that operate at a poor level of service, safety issues
• Evaluate Land Use/Development Options• Environmental Laws
• NEPA (National Environmental Policy Act)• CEQA (California Environmental Quality Act)
• Assess Impact Fees
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How do we prepare a TIA? – Getting Started
Determining if a TIA is required? • Obtain Site Plan (Get involved in site plan development)• Evaluate Criteria
Scoping Process• Talk to jurisdiction/agency staff• Determine:
› Study Area
› Analysis Time Periods (AM Peak, PM Peak, etc.)
› Analysis Scenarios (Existing, Background, Project, Cumulative, Phasing, Alternatives)
› LOS Calculation Methods (2000 HCM, Circular 212)
› Significance Criteria (LOS Thresholds, Left-turn Queues, Neighborhood Issues, Neighborhood Intrusion, Safety Issues)
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How do we prepare a TIA? – Site Reconnaissance & Data Collection
• Visit the Site to Collect: • Lane configurations• Traffic control devices• Speed limits• Turn lane lengths • Transit stops• Pedestrian facilities
• Observe study period conditions• Data collection:
• Turning movement intersection counts
• ADT• Vehicle classification• Accident history
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How do we prepare a TIA? – Analysis• Determine the appropriate tool for the analysis: Isolated
intersection analysis vs. micro-simulation
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How do we prepare a TIA? – Project Trip Generation
• Published Rates (ITE, RTC, Caltrans), surveys
• Factors that affect vehicle trip generation: Pass-By trips,
Internalization, transit, and others.
1991
1997
2003
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How do we prepare a TIA? – Project Trip Distribution
• Existing Travel Patterns
• Complementary Land Uses (i.e. Residential and Office Uses)• Zip Code Data• Census Data• Travel Demand Model• Engineering Judgment
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How do we prepare a TIA? – Project Conditions Analysis
• Add project traffic to existing conditions• Analyze LOS, Queuing, Impacts to transit/pedestrian facilities/bicycle facilities, etc.• Determine Impacts • Recommend mitigation measures…
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How do we prepare a TIA? – Project Conditions Analysis – Mitigation Measures
• Traffic Signals• Signal Warrants
• Lane Additions• Access Modifications/
Access Management• Changes to Project Description• Left-Turn Restrictions• Roundabouts• Roadway Widening• Traffic Signal Coordination • Transportation Demand Management Programs• Impact Fees
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How do we prepare a TIA? – Cumulative Conditions/Future Year Analysis
• 20 to 30 year horizon • Typically a planning level analysis – roadway
segment• Determine future traffic volumes
• Travel Demand Model • Growth Rate • Historical Data• Known long term projects• General Plan documents
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How do we prepare a TIA? – Site Access
Private Driveway Design Criteria • Location/Spacing • Permitted Turning Movements • Signalization• Width• Offsets• Grade• Emergency Vehicle Access• Sight Distance
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How do we prepare a TIA? – Site Circulation
Throat Depth Requirements
Source: Access Management Manual (TRB)
Source: Transportation and Land Development (ITE)
Driveway WidthSource: NDOT Access Management System and Standards, 1999
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How do we prepare a TIA? – Site Circulation
• Drive Aisle Width • Dead-End Drive Aisles• Pedestrian Conflicts• Parking Supply vs. Demand• Truck Delivery Movements
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How do we prepare a TIA? – Site Circulation
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