Traffic flow
（重定向自Traffic flow theory）
![Figure 1. Time Space diagram](/Images/godic/202502/17/Time_Space_Diag_Figure_12512.JPG")
![Figure 2. Space Mean- and Time Mean speeds](/Images/godic/202502/17/Mean_space_and_time_speed2512.png")
![Figure 3. Flow Density relationship](/Images/godic/202502/17/Flow_Density_Relationship2512.png")
![Figure 4. Relationship between flow (q), density (k), and speed (v)](/Images/godic/202502/17/Relationship_between_q_k_and_v2512.png")
In mathematics and civil engineering, traffic flow is the study of interactions between vehicles, drivers, pedestrians, cyclists, other travelers and infrastructure (including highways, signage, and traffic control devices), with the aim of understanding and developing an optimal road network with efficient movement of traffic and minimal traffic congestion problems.