In an intersectional left-turn collision accident, it is located with the back existence of motorbike. It an operation support system which prevents the collosion accident at the time of left turn by offering dangerous information by real-time communication through electric wave to the vehicles which detect speed information etc. by the way side sensor in advance and on which the motorbike front turns left with the road antenna from a center processing device. This run experiment year of 2010, is conducted at the crossing in Tokyo, and is continued and carried out towards employment still now. It explains the way side of the prevention support system from a left-turn collision focusing on the subject towards the principle of operation of a whole system, and an experimental result and future employment including an in-vehicle device.
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