What type of light fixture height corresponds to roads more than 40 ft wide?

The correct choice pertains to the standard height recommendations for light fixtures installed over roads with a width greater than 40 feet. When designing roadway lighting, it is crucial to provide sufficient illumination for both visibility and safety, particularly on wider roads.

For roads that are more than 40 feet wide, a light fixture height of 6-12 feet is optimal. This height range allows for adequate light distribution across the road and prevents dark spots that could pose hazards for drivers and pedestrians. The 6-12 foot range balances the need for sufficient upward angle for light to reach the road surface effectively while also considering environmental factors such as obstructions and the angles of road approach.

Fixture heights below this range, such as 0-6 feet or 6-10 feet, may not provide enough coverage for wider roads. Higher fixtures, like those in the 10-15 feet range, may also not be favorable in terms of light distribution efficiency and could lead to excessive glare for drivers.

Overall, utilizing a height range of 6-12 feet aligns with best practices for illuminating roads that are more than 40 feet wide, ensuring safety and visibility standards are met while promoting an effective lighting layout.