What distance is cited for the reflective triangle to provide adequate warning when visibility is blocked?

• A. 500 feet
• B. 100 feet
• C. 1000 feet
• D. 50 feet

Answer: (A)

Providing adequate warning distance when visibility is blocked is essential for safety. Reflective triangles are placed to alert drivers ahead so they have time to see the hazard and slow down before reaching it. The distance cited is 500 feet because it gives approaching traffic a clear early cue on high-speed roads, while still being practical to place and visible in typical conditions. If you put the triangles much closer (like 50 feet), drivers may not notice them in time; a distance like 100 feet is useful in urban settings but may not be enough on highways when visibility is reduced; 1000 feet is often more than necessary and can complicate proper placement. So 500 feet strikes the right balance for providing adequate warning when visibility is blocked.