Traffic engineering is a branch of civil engineering focused on designing and improving transportation systems to ensure efficient and safe movement of people and goods. This field encompasses a wide range of topics including traffic flow theory, traffic signal operations, road design, transportation planning, and intelligent transportation systems. Traffic engineers use various tools and techniques such as traffic modeling, simulation, and optimization to analyze and improve traffic flow, reduce congestion, and enhance overall transportation network performance. Overall, the goal of traffic engineering is to optimize the use of existing infrastructure and resources to maximize the efficiency and safety of transportation systems.