How long should the minimum rail length be for Type III barricades?

The minimum rail length for Type III barricades should be 4 feet. This requirement ensures that the barricades are sufficiently visible and effective in guiding and controlling vehicular and pedestrian traffic around work zones. The 4-foot rail length provides a balance between visibility and structural stability, making the barricade more effective at conveying the necessary warnings and guiding traffic safely.

Type III barricades are typically used for delineating work zones and are designed to provide clear guidance and protection. A shorter rail would not provide enough visibility, especially in adverse weather conditions or at night, which could lead to safety hazards. Additionally, a longer rail could introduce challenges in terms of transport and setup in certain applications. Therefore, the standard of 4 feet strikes an optimal balance to ensure safety and functionality in temporary traffic control.