Training > Site Impact Analysis

Site Impact Analysis Course

This course covers the priniciples and information contained in the ITE’s Trip Generation Report and the ITE recommended procedure for conducting Traffic Impact Studies. The class will cover how to select trip generation rates and adjust trips for internal capture and passby trips. Issues that will be discussed include what should be covered in methodology meetings and procedures for developing background traffic. Also sessions in mode split, site trip distribution and assignment, mitigation techniques, site circulation, and level of service analysis are part of the course. The course will conclude with a class problem for analyzing a site impact of a proposed development. A workbook is provided and a general agenda for the two-day course follows:

Day 1

Welcome and Introductions Roster sign-in, workbook distribution, agenda, schedule, informal discussion.
Standard Site Impact Process Overview and discussion of the ITE Ten Steps
Methodology Meeting Review of study boundary, horizon year, and acceptable methodologies
Existing Condition Analysis Analysis to determine the existing levels of service
Background Traffic How to determine future traffic without the site development
Trip Generation Using the ITE Trip Generation manual to determine site generated trips
Internal Capture Discussion of internal capture and reduction of a mixed-use development
Internal Capture Workshop Demonstration of how to balance internal capture trips

Day 2

Pass-By Trips Explanation of what pass-by trips are and how to determine the percentage
Pass-By and Internal Capture Workshop Demonstration of pass-by and internal capture adjustments to trip generation
Mode Split How to account for transit, bicycle, pedestrian trips and auto occupancy
Trip Distribution and Assignment Distribution (proportions and the gravity model) and Assignment (manual and model)
Future Conditions Analysis and Mitigation Levels of service with and without the development and mitigation strategies
Site Access, Circulation and Parking Issues and methods for addressing how to locate and develop access connections
Team Workshop Development of a traffic impact analysis for a proposed development in teams


Dane Ismart is with Louis Berger & Associates, retired from the Federal Highway Administration (FHWA) after 25 years of service in a variety of policy, planning and engineering positions. He was responsible for implementing the Intermodal Management Systems regulations. Mr. Ismart has authored manuals and taught NHI courses on Capacity Analysis, Access Management, Financial Management, Travel Demand Forecasting and Intermodal Planning, and is a member of the TRB Highway Capacity Subcommittee on Unsignalized Intersections. Mr. Ismart is a graduate of Georgia Tech with a Bachelors Degree and received his Masters Degree in Civil Engineering from the University of Minnesota.

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