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Cars coming from the both directions can go smoothly because the car access indication system tells drivers the existence of oncoming car. This system should be set in mountainous road after it becomes cheap. It is said that the system got a favorable receptions from the road users, however only a limited effect is investigated. Therefore, it is necessary to measure the effect of the system quantitatively by researching changes of vehicle behavior and the neighborhood's consciousness before andfatcat:wc4wydc5wrgf3phfmtf2jccmk4