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| street light ： ウィキペディア英語版 |
street light
A street light, light pole, lamppost, street lamp, light standard, or lamp standard is a raised source of light on the edge of a road or walkway. Modern lamps may also have light-sensitive photocells that activate automatically when light is or is not needed: dusk, dawn, or the onset of dark weather. This function in older lighting systems could have been performed with the aid of a solar dial. Many street light systems are being connected underground instead of wiring from one utility post to another.
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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