What length of mast arm is used where streets are more than 40 ft wide?

The use of a 12-foot mast arm in locations where streets are more than 40 feet wide is optimal for ensuring adequate clearance and visibility of overhead elements, such as streetlights or traffic signals. This length provides a balance between coverage area and safety, allowing for efficient placement that keeps equipment above the height of vehicles and pedestrians while maximizing illumination or signal effectiveness.

When streets exceed 40 feet, a longer mast arm like the 12-foot option is necessary to reach beyond the width of the roadway. This ensures that light or signal distribution adequately covers the entire street area, promoting better visibility and safety for all road users. Shorter options such as the 8-foot or 10-foot arms may not provide sufficient reach and could lead to impaired visibility, while a 14-foot arm may be unnecessarily long and could complicate installation and maintenance procedures without a significant benefit for most street applications.