Traffic engineering is that phase of engineering that deals with the planning, geometric design and traffic operations of roads, streets and highways and their networks, terminals, abutting lands and relationships with other modes of transportation for the achievement of safe, efficient and convenient movement of people and goods.

Traffic engineering applies engineering principles that help solve transportation problems by considering the psychology and habits of the transportation system users.

Active studies, as well as those that are programmed (funded but not yet assigned to a consultant), are listed online in the Research in Progress database. To learn more about these studies:

The FHWA State Planning and Research (SPR) program funds most research projects following the requirements of 23 CFR 420. Those projects are designated as “SPR” plus a project number assigned by the Research Center, e.g, SPR-595.

The ADOT project manager, in cooperation with the sponsor and champion, leads the process of identifying TAC members, developing a scope of work, releasing a solicitation, and selecting a consultant to conduct the study.

The RAC consists of staff from the Research Center, various ADOT Divisions, and the Federal Highway Administration (FHWA). Membership is intended to represent a wide variety of fields and interests within the department. Working in an advisory capacity, members review problem statements for new research and consider recommendations for funding.

A problem statement describes an idea for future research, and is presented to the ADOT Research Advisory Committee for consideration of funding. It briefly states the existing problems to be addressed and the objectives that would be met by the requested research. It does not prescribe a methodology, include a scope of work, or call for the use of specific products or providers. In general, a problem statement raises questions that would be answered by the suggested research, but does not presume to know the answers.

The TAC consists of ADOT subject matter experts, including the sponsor and champion, who critically review the technical content of research deliverables. When appropriate to the study topic, the TAC may also include staff from other public sector agencies. Active participation by TAC members is necessary to ensure that a research study fulfills its objectives.

The ADOT project manager is responsible for guiding the study from conception through completion and for ensuring that scope, schedule, and budget are met. The PM manages the consultant and the review and revision of deliverables. Deliverables are considered complete only after the approval of the ADOT project manager.

The goal of every research study is to produce implementable results. Every study must have both a sponsor and a champion to ensure support for the project and its implementation. Research Center project managers can assist in the identification of a sponsor and champion for a research idea based on its subject matter and objectives. 

A sponsor must be in a position to have the authority to make decisions on a study’s recommendations, and the ability and commitment to implement them. 

Qualified contractors from the private sector and public universities typically conduct the research studies managed by the Research Center staff. A contractor is hired through ADOT’s contracting and procurement process. Under certain circumstances, other State of Arizona agencies may be contracted to perform the studies.