Purpose of a Traffic Impact Assessment

A traffic impact assessment report serves the following practical and legal purpose for both developers and approval authorities:

Predicts Traffic Issues and Recommends Solutions

  • A TIA documents the potential traffic impact of a new development on the surrounding road network.
    • Using the site statistics and expected levels of occupancy, a TIA report provides a methodological estimate of the number of vehicles entering and exiting the facility during peak traffic hours of a typical day.
  • Recommends technical solutions to potential congestion and safety issues caused by increased development related traffic.
    • If a traffic analysis shows that the road network leading to a development will be subject to congestion delays, then the report must also provide solutions to manage those issues. These could be changes to signal timing plans, installing new traffic signals, constructing an underpass, or even building a new bypass road. In extreme cases where no feasible solution is available, a developer may need to reduce the size of their development.
Purpose of Traffic Impact Assessment
A traffic impact assessment predicts the directional flow of traffic related to a subject development

Ensures Development Functionality

  • Some Traffic Impact Assessments include site plan assessments (parking regulation, driveway widths, safety measures, vehicle circulation)
    • A TIA report demonstrates the functionality of a development’s site plan in terms of its vehicular operations. Is there an adequate supply of parking spaces for the number of vehicles expect to be on site? Is there enough clearance in the driveways to allow vehicles to circulate without crashing into the building or each other? Can larger vehicles such as fire trucks, and garbage trucks access the site without obstruction?
site plan assessment in TIA
Site Plan analysis includes review of a development’s parking plan

Serves Legal and Liability Purposes

  • A legal document that implies who is causing congestion and who should pay for improvements
    • A TIA report can used in court as evidence over a dispute on the cause of congestion and its solver. Developers tend to reduce their project costs and hence try to avoid paying for public infrastructure improvements. In that scenario, the TIA report is worded to suggest that congestion existed prior to the developer’s project and therefore the road authority, usually a government body, shall bear the costs of road improvements.
    • However, there are also instances where a developer believes a road improvement is good for business and would be willing to pay for it. In that case the TIA report would justify the need for such an improvement if a road authority is not in favor of it.

This was a brief post about the purpose of a traffic impact assessment report and its use for developers and road authorities. Learn about how to prepare a traffic impact assessment report and the requirements of traffic impact assessments.

Bonus Material

Does keeping your car in neutral gear at red lights save fuel

Watch how roads are painted with pavement marking

Why are casio watches so popular

Can you wear normal contacts with astigmatism