What is the required height of tubular markers when used at night?

The correct height of tubular markers when used at night is 28 inches. This specification is important because the height ensures that the markers are visible to motorists, especially in low-light conditions, such as nighttime or poor weather. The height of 28 inches is generally recognized as an adequate standard that enhances visibility and minimizes the risk of accidents in work zones. Tubular markers are specifically designed to delineate traffic paths and indicate hazards, so maintaining the correct height is crucial for overall safety on the road.

In contrast, markers that are too short may be overlooked by drivers, while excessively tall markers might pose an obstruction or safety hazard themselves. The established guidelines take into consideration factors like the average driver's line of sight and the need for effective visual cues that guide them safely through temporary traffic control areas.