How high should cones be at night on all highways?

The height of cones used on highways at night is crucial for visibility and safety. Cones that are 28 inches tall are designed to be easily seen by drivers, especially in low-light conditions. This height strikes a balance between being tall enough to be noticed from a distance while remaining stable in various weather conditions.

The visibility of traffic control devices at night is enhanced by their height, ensuring that they stand out against the backdrop of headlights and other distractions. Higher cones, like those at 32 inches, may not provide significant additional benefits and can be more susceptible to being knocked over by wind or vehicles.

The lower options, such as 18 or 24 inches, may not offer adequate visibility for drivers traveling at high speeds on highways, increasing the risk of accidents. Therefore, using 28-inch cones is the best practice for enhancing nighttime visibility and ensuring driver safety on highways.