Do the left-turn arrow and circular light turn green simultaneously?
1 Answers
Depending on road conditions, some left-turn arrows and circular lights in urban traffic systems turn green simultaneously. Urban Road Traffic: Urban roads prioritize user experience with a human-centered approach, emphasizing subjective comfort due to the economic development levels of different city areas and prominent road network hubs. They exhibit stronger humanistic elements, making them more user-friendly. Highways, however, focus more on technical aspects, prioritizing regional traffic efficiency. Except for administrative attributes influencing road network density and grade, highway networks are uniformly coordinated, better meeting the fundamental functional requirements of road engineering—ensuring unimpeded access to all necessary destinations. Traffic Light Design Principles: The simplest current method is timed control, where the activation and deactivation durations for each direction are preset. More complex systems use microcontroller or PLC programming, enabling different control strategies across time periods, synchronized or interlocked traffic signals for various directions, and adaptable control policies. The most advanced approaches involve adaptive control and intelligent transportation systems, now implemented in many major cities. These systems adjust signal timing dynamically based on real-time feedback from road sensors and cameras to optimize traffic flow.
