How can daylight glare affect warning lights, and what should you do?

• A. Glare improves brightness; point lights toward sun.
• B. Glare has no effect; keep lights constant.
• C. Glare makes lights illegal to use.
• D. Glare reduces visibility; adjust brightness and position to maximize effectiveness.

Answer: (D)

Daylight glare makes warning lights harder to see because bright ambient light washes out their contrast. When the sun or other bright sources shine into the beam path or your eyes, the lights can appear less distinct, so drivers may not notice them as quickly. The best approach is to increase the warning lights’ brightness to maintain visibility, but within legal limits, and to adjust their position or angle so the beams are directed to maximize visibility for other drivers rather than toward the sun. Think about aiming the lights to cover the travel lane and not into the sun, and ensure the lights aren’t obstructed or dirty, which can further reduce visibility in bright conditions. The overall goal is to preserve clear, high-contrast warning signals even in daylight by balancing brightness with proper aiming.