Recommended Transportation Impact Analysis (TIA) Format
The Transportation Impact Analysis (TIA) should follow a structured format to comprehensively assess the project's effects on the local transportation network, including vehicle, pedestrian, bicycle, and transit facilities. Below is the recommended format for the TIA report.
1. Executive Summary
The report begins with an Executive Summary, providing a high-level overview of the analysis. This section includes a table summarizing significant impacts and mitigation measures, outlining the key findings and proposed improvements.
2. Introduction
The Introduction section defines the purpose and objectives of the TIA, providing context for the study. It includes:
- A vicinity map illustrating the project location.
- A description of the project, including its size and scope.
- Details on existing and proposed land use and zoning.
- A site plan showcasing the project layout.
- Information on the proposed project’s opening year and analysis scenarios to establish the time frame for evaluation.
3. Methodology and Impact Thresholds
This section outlines the methodology used in the analysis, defining the impact thresholds and evaluation criteria.
4. Existing Conditions
A detailed assessment of current conditions includes:
- Roadway network overview, including key corridors.
- Traffic control measures and intersection geometrics (Exhibit).
- Existing traffic volumes during AM and PM peak hours and Average Daily Traffic (ADT) (Exhibit).
- Intersection Level of Service (LOS) (Table).
- Existing bicycle, pedestrian, and transit facilities, with relevant maps or exhibits.
5. Project Traffic
This section details the project's traffic impact, including:
- Trip generation analysis, quantifying new trips (Table).
- Trip distribution and assignment, showing expected travel patterns (Exhibit).
- Peak hour turning movements and ADT (Exhibit).
6. Background Conditions (Opening Year) Analysis
An evaluation of future conditions at project opening year under two scenarios:
- No Project Analysis, which examines traffic with committed roadway improvements and approved developments.
- Plus Project Analysis, which incorporates the project’s traffic and identifies potential deficiencies in intersections and roadway segments.
7. Cumulative Year Analysis
This section examines long-term transportation conditions under:
- No Project Analysis, which accounts for planned developments and committed improvements.
- Plus Project Analysis, assessing the combined impact of the project and other cumulative developments.
8. Traffic Signal Warrant Analysis
Determines if new traffic signals are required based on traffic volumes and safety considerations.
9. Site Access Analysis
Evaluates the adequacy of site access points, including driveway locations and circulation patterns.
10. Safety and Operation Improvement Analysis
Analyzes potential safety concerns and recommends operational improvements.
11. Active Transportation and Public Transit Analysis
Assesses the project's impact on bicycle, pedestrian, and transit facilities, ensuring compliance with relevant policies and identifying necessary improvements.
12. Improvements and Recommendations
Proposes intersection and roadway segment improvements, categorizing them by whether they are included in an adopted fee program.
13. Vehicle Miles Traveled (VMT) Analysis
Evaluates the project's impact on VMT, including:
- VMT per person or employee.
- Effect on VMT across analysis scenarios.
- Identification of significant VMT impacts.
- Proposed VMT mitigation measures.
14. Appendix
Includes supporting documentation such as the approved scope of work, traffic counts, analysis worksheets, VMT calculations, and signal warrant assessments.
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