Traffic Impact Assessment (TIA)

Traffic Impact Assessment (TIA) study can identifies the need for any improvements and mitigating measures to the adjacent and nearby roadway system to maintain a satisfactory Level of Service (LOS) and safety of the roadway network in the vicinity of the proposed development.

Traffic Impact Assessment (TIA) Objectives:

The main purpose of this study is to assess the traffic impact for construction of the New Projects in any area.

• To determine Annual Average Daily Traffic of the existing roads of the study area
• To determine speed and delay of the study areas roads.
• To analyze Level of Services of the existing road condition
• To calculate vehicle compositions of the study area.
• To predict future volume of traffic in the study area
• To analyze footpath Level of Services.
• To analyze willing to pay conditions of the study area
• To existing transportations infrastructures and facilities
• Future Traffic Volume Analysis

Methodology of Traffic Impact Assessment (TIA):

The conceptual framework of this study is designed based on the previous traffic impact assessment literature. The frame is started on reviewing previous literature and end with the outcome of this study. Field visit is for preliminary concept about study area which gives basic information in the locality. Inventory survey includes the important location in the locality and some opinion of the local people about the study area which helps to make final questioner survey form. The data collection is mainly based on the traffic survey and willing to pay survey. Finally, the survey data is analyzed and visualized. The final recommendation is based on the outcome of the study.

The traffic growth of any nation depends on the economic and cultural development of the nation. The economic development can be assessed from GDP, NSDP and PCI of the respective state or nation. The cultural development and population growth effect mainly the passenger traffic modes. The present analysis is concentrated on economic growth and population growth as main key parameter.

Traffic Condition in Bangladesh:

Analysis of state wise contribution of traffic flowing through the study area is important to analyses the impact of state growth on the traffic growth. Dhaka, Gazipur, Chittagong and Narayangonj states are identified as the major traffic contributing states on the present study area from number plate survey. The percentage of state wise traffic contributions are calculated from the data collected by conducting one day number plate survey on working day of a week and the data is presented in our Traffic Impact Assessment (TIA). The major passenger and goods traffic were contributed by Dhaka, Gazipur and Narayanganj states goods traffic contribution was more compared to Chittagong contribution.

Process of Traffic Impact Assessment (TIA):

Traffic Impact Assessment (TIA) is a valuable tool for assessing potential impacts of traffic

generated by a proposed development to the surrounding transportation system. TIA generally includes a description of the scope and intensity of the proposed project, a summary of the projected impacts and any required improvements to ensure that the roadway facilities can safely accommodate the proposed development. The goal is to ensure that the transportation system will operate safely and efficiently within the design horizon of the study.

A well-prepared TIA helps the developer and permitting agency accomplish the following:

• Forecast the traffic impacts created by a proposed development by developing reasonable future traffic volumes for design purposes.
• Determine if improvements are needed to accommodate background traffic and the traffic from a proposed development.
• Allocate funds more efficiently.
• Relate land use decisions with traffic conditions.
• Evaluate the number, location, and design of access points.
• Update traffic data (projections).
• Provide a basis for determining the developer’s responsibility for specific off-site improvements.

When Is a Traffic Impact Assessment (TIA) Required?

Any development needs to have adequate infrastructure to support it, whether utilities or

transportation. As a result, every proposed development requires an assessment of the adequacy of the site (e.g., compatibility with highway and municipal plans, access location(s), geometry, capacity, traffic control, etc. and any necessary improvements to safely accommodate the proposed development. In general, there are two levels of assessment that may be required in support of a development:

Comprehensive Report: used for larger development with significant traffic impacts or at complex location where the recommended improvements require a detailed analysis.

Memo Report: may be used for small development with low traffic impacts at simple location where the recommended improvements can be assessed in a memo format.