What is the minimum size of cone that can be used at night for a lane closure?

The minimum size of a traffic cone to be used at night for a lane closure is 28 inches. This size is deemed necessary to ensure visibility and safety in low-light conditions. When it comes to nighttime operations, larger cones provide better visibility to drivers, helping to clearly delineate the closed lanes and any potential hazards.

Using a cone that is 28 inches tall means it is more easily seen by motorists, especially when illuminated by vehicle headlights, which is crucial for maintaining safe traffic flow and ensuring that drivers can react appropriately to the lane closure. A cone of this size meets the necessary standards outlined for nighttime safety measures, thereby contributing to effective maintenance of traffic during roadwork or lane closures.