A traffic impact study evaluates how a proposed development or project may affect nearby roads, intersections, access, and other transportation facilities.
Definition
A traffic impact study examines transportation conditions around a proposed development or other project and evaluates potential effects under a defined set of assumptions. Depending on agency requirements and the agreed scope, it may include existing traffic data, trip generation, trip distribution, intersection or roadway analysis, access review, safety context, and potential improvements. The study area, analysis periods, methods, and deliverables should be identified in the scope because agencies and firms may define them differently. Firms may price the work by task, staff hours, or a fixed fee based on the required data collection, modeling, coordination, and review rounds. The study is not a guarantee of future traffic conditions, a construction design, or an approval by the reviewing agency. Its conclusions depend on the selected methods and available information. For federal-aid context, see FHWA.
How owners use it
- Owners use the defined study area, analysis tasks, and review rounds to estimate fee and schedule.
- A proposal budgets 24 analyst hours at $150 per hour: 24 × $150 = $3,600.
- Project managers track data collection, analysis, and agency comments against the authorized scope.
- Owners distinguish study findings from design services or agency approval when reviewing deliverables.
