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Transportation Impact Analysis Presented By Katy Flynn, P.E. Fehr & Peers February 19, 2008.

Published byKylie Farrell Modified over 11 years ago

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Presentation on theme: "Transportation Impact Analysis Presented By Katy Flynn, P.E. Fehr & Peers February 19, 2008."— Presentation transcript:

1 Transportation Impact Analysis Presented By Katy Flynn, P.E. Fehr & Peers February 19, 2008

2 Presentation Overview What is a Transportation Impact Analysis? Why do we prepare Transportation Impact Analyses? How do we prepare a Transportation Impact Analysis?

3 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.

4 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

5 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)

6 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

7 How do we prepare a TIA? – Analysis Determine the appropriate tool for the analysis: Isolated intersection analysis vs. micro-simulation

8 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. 199119972003

9 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

10 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…

11 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

12 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

13 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

14 How do we prepare a TIA? – Site Circulation Throat Depth Requirements Source: Access Management Manual (TRB) Source: Transportation and Land Development (ITE) Driveway Width Source: NDOT Access Management System and Standards, 1999

15 How do we prepare a TIA? – Site Circulation Drive Aisle Width Dead-End Drive Aisles Pedestrian Conflicts Parking Supply vs. Demand Truck Delivery Movements

16 How do we prepare a TIA? – Site Circulation

17 www.fehrandpeers.com www.smartgrowthplanning.org www.trafficsimulation.org www.trafficcalming.org Reno, NV 775-826-3200 Denver, CO 303-296-4300 Salt Lake City, UT 801-463-7600 San Francisco, CA 415-348-0300 Walnut Creek, CA 925-930-7100 Roseville, CA 916-773-1900 Sacramento, CA 916-329-7332 San Jose, CA 408-278-1700 Los Angeles County, CA 310-458-9916 Orange County, CA 949-859-3200

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