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| Vehicle activated sign ： ウィキペディア英語版 |
Vehicle-activated sign
Vehicle activated sign (VAS) is a generic term for a type of road traffic sign which displays a message conditional upon the presence, or speed, of a . The devices are deployed on roadsides like regular traffic signs in various countries. They are intended to help drivers by alerting them and drawing attention to danger or other undesirable situation.
==Sign types==
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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