How are signal heads typically mounted?

Answer: B — On poles or mast arms above the intersection

Signal heads are typically mounted on poles or mast arms above the intersection for several important reasons. This elevated positioning ensures that the lights are clearly visible to drivers and pedestrians from a distance, enhancing safety by making signals easily recognizable. Placing signal heads above the intersection reduces the risk of obstructions, like vehicles or pedestrians, interfering with visibility. Additionally, mounting on poles or mast arms allows for proper alignment of the signal heads in relation to oncoming traffic lanes, ensuring that signals are directed appropriately. This placement also takes advantage of standard traffic management practices, which require a specific height and angle to achieve optimal visibility and compliance with traffic control standards. Consequently, this method of mounting is widely adopted to ensure effective traffic signal operation and management.