What is the recommended visibility distance for arrow boards at night?

The recommended visibility distance for arrow boards at night is 1 mile. This standard ensures that drivers can see and respond to the signals in a timely manner, enhancing safety on the roads. The visibility distance takes into account various factors such as the brightness of the arrow board, ambient light conditions, and the speed of oncoming traffic. Proper visibility supports effective traffic control by providing drivers ample time to react and adjust their speed or path as necessary.

Ensuring that arrow boards are visible from this distance helps to prevent accidents and facilitates smoother traffic flow, especially in work zones where conditions can change rapidly. This standard is part of the broader guidelines that aim to maintain safe working environments for both road users and construction personnel.