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.
Many people still wonder why a traffic problem is so difficult that an engineer should be called upon for a solution. Why not just install a traffic signal, or raise/lower the speed limit, or erect more signs?
One of the greatest obstacles a professional traffic engineer faces in applying sound principles of traffic engineering is competing theories from vocal non-traffic engineers who lack expertise. The unfortunate result is the creation of traffic hazards when false theories are put into effect. Whenever unnecessary or excessive traffic controls are installed, hazardous traffic conditions usually result.