What is the main function of traffic flow theories?

The primary function of traffic flow theories is to describe the behavior of traffic streams. These theories provide a framework for understanding how vehicles interact with one another on roadways, which includes aspects such as flow rates, vehicle densities, and speeds. By analyzing these characteristics, engineers can identify patterns in traffic movements, predict traffic congestion, and develop strategies for managing roadway performance effectively.

Traffic flow theories lay the groundwork for modeling and simulating traffic behavior to inform infrastructure design and traffic management practices. This knowledge is essential for optimizing the operation of transportation systems, enhancing safety, and improving mobility for all road users.

The other choices revolve around aspects influenced by traffic flow theory but do not capture its primary purpose. For example, although enhancing public transit systems and determining road service levels benefit from a strong understanding of traffic behaviors, they are not the core focus of what traffic flow theories aim to achieve. Establishing vehicle speed regulations also relies on traffic behavior but is a regulatory outcome rather than the fundamental theory itself.