TRAFFIC IMPACT ASSESSMENT

What is Traffic Impact Analysis?

A traffic impact analysis is a study which assesses the effects that a particular developments traffic will have on the transportation network in the community.

What is Traffic Impact Analysis?What is Traffic Impact Analysis?

Allow the community to assess the impacts that a proposed development may have. Help to ensure safe and reasonable traffic conditions on streets after the development is complete. Reduce the negative impacts created by developments by helping to ensure that the transportation network can accommodate the development. Provide direction to community decision makers and developers of expected impacts. Protect the substantial community investment in the street system.

Steps of Traffic Impact Assessment Determination of scope of work

GENERALThe scope of work for the conduct of TIA includes but is not limited to the following:-Transportation Improvements-Road Geometry-Traffic Safety-Site Circulation and Parking-Transportation facilities related to public transport, bicycle and pedestrian travel-Transportation Demand Management-Neighborhood Traffic and Parking Management-Funding for countermeasures

Determination of scope of work Minimum Study Area

Additional Study Area

High Traffic Impact Areas

2. Data

Secondary Details of the proposed development -Exact location of the project -Floor area and land use-Inventory of provided facilities Established rates for generation and attraction (to be provided)2. Data Primary Network , geometric and traffic control data within the influence area including pedestrian facilities Existing traffic flow: Traffic flow volume, OD, directional movements, speed, parking inventory, etc. Predicted traffic: Traffic flow volume, OD3. Analysis Calculate Required road width and intersection capacity -Four-step model-Analogy method Required parking facilities Required loading and unloading facilities TRIP GENERATION - It predicts the number oftripsoriginatingin or destined for a particulartraffic analysis zone. The trip generation process provides an estimate of thenumber of trips that will be generateddue to the new development.

PARKING GENERATION - a document prepared by theInstitute of Transportation Engineers that summarizes a collection ofparking demand data observations made all over the world by land use type. Parking Generation providesstatisticson the average peak parking demand, when the peak demand occurs, range, coefficient of variation andstandard deviationdata.

4. Recommendations Compare required vs. existing (or expanded ) Roadway and intersection capacity Parking facilities Provide remedial measures if required Why Required? New developments Produce/ attract new traffic-Production: Residences-Attraction: Shops, Offices, Schools, Hospitals etc. etc. Changes in traffic pattern -Mode diversions- Route diversions -Peaking time, etc. Why Required? Any large land development near major junctions and/or major urban arterials requires careful investigation of the access facilities to and from adjacent roadways.

The evaluation of any negative traffic impacts must be carefully reviewed and if necessary, mitigation strategies must be implemented to ensure trouble free traffic operations in and around such a development.

Safe and smooth traffic operations in and around commercial developments are not only essential for the community at large, but are also critical for a development to succeed. When Required? When a specified area is being rezoned.

When development involves a specified number of dwelling units or floor space.

When development occurs in a sensitive area (e.g. near major intersections, critical business district, area already having traffic problems, etc.)

When financial assessments are required and the extent of impact must be quantifiedReference/s: