Road lighting is essential for road facilities, as it ensures traffic safety at night, increases road utilization, and enhances the beauty of urban streets. In order for car drivers to drive safely and comfortably on roads, it is necessary to be able to see the entire forward field of vision clearly regardless of day or night, and to be able to obtain various visual information from a sufficient distance for safe driving.

• Places subject to vibration when a vehicle traveling at high speed passes by.
• Places susceptible to wind loads due to strong winds such as typhoons.
• Places where maintenance work is not easy.

• The maintenance period has been greatly extended, and the burden on workers has been reduced.
• Reduced maintenance costs.
• It was effective even when the extra length of the bolt was small with the double nut.