What are the two nominal diameter sizes for vehicular signal lenses?

In the context of vehicular signal lenses, the standard sizes are critical for ensuring visibility and compliance with traffic management regulations. The correct nominal diameter sizes for vehicular signal lenses are commonly recognized as 8 inches (200 mm) and 12 inches (300 mm). These sizes provide optimal viewing distance and clarity for drivers, allowing for effective communication of traffic signals.

The 8-inch lens is typically used for standard traffic signals, while the 12-inch lens is employed for signals that need to be seen from farther away or in more complex traffic environments. This adherence to established standards ensures consistent signal size across different jurisdictions, enhancing safety and reducing confusion on the road.

Understanding the correct sizes is crucial for signal technicians, as using incorrect sizes can impact both the functionality of the traffic signal system and the safety of road users. This knowledge is fundamental when installing or maintaining signal equipment, emphasizing the importance of aligning with the recognized dimensions outlined in traffic guidelines and regulations.