What condition can impair the effectiveness of traffic control devices?

Heavy rain or snow can significantly impair the effectiveness of traffic control devices due to visibility issues and changes in road conditions. Adverse weather can obscure signs, reduce the brightness of lights, and make road markings harder to see. Furthermore, wet or icy road surfaces can affect vehicle traction, making it more difficult for drivers to respond to traffic control devices as intended. In scenarios with severe weather conditions, drivers may have trouble adhering to the guidance provided by these devices, increasing the risk of accidents or unsafe driving behavior.

This highlights the importance of ensuring that traffic control devices are properly maintained and clearly visible, especially during adverse weather conditions, to protect both workers in the work zone and road users.