Traffic Flow Theory is a field of study that examines how vehicles move on roadways. It focuses on understanding the relationships between traffic density, speed, and flow. By analyzing these factors, researchers can develop models to predict traffic behavior, which helps in designing better road systems and managing congestion. The theory uses various concepts, such as traffic density (the number of vehicles per unit length of road) and traffic flow (the number of vehicles passing a point over time). These concepts help traffic engineers and planners create effective solutions to improve road safety and enhance overall transportation efficiency.