At what times should traffic controls be set up or taken down in a night traffic control zone?

The correct timing for setting up or taking down traffic controls in a night traffic control zone is a half hour before sunset and half hour after sunrise. This allows for adequate visibility and safety for both traffic control personnel and drivers, ensuring that the transitions between day and night are managed effectively.

Setting up traffic controls too early can lead to confusion and unnecessary disruption during the twilight period when visibility is still adequate. Conversely, taking them down too late can expose roads to unexpected hazards during the early dawn hours when visibility may be limited.

The selected timing ensures that the traffic controls are in place just as natural light is diminishing and remain until sufficient light is available after the sun rises. This approach is crucial for maintaining safety standards on the roads and ensuring that all roadway users can navigate traffic control zones effectively.