In Japan, the Ministry of Construction is conducting research and development of Advanced Cruise Assist Highway Systems (AHS). AHS are intended to improve both the safety and efficiency of road traffic and to reduce its environmental load, but it is necessary to quantitatively establish the necessary conditions, or in other words the requirements for system development in order to complete the systems. Requirements are the performances needed to provide the functions necessary for the development of AHS systems that reflect public needs such as traffic accident prevention and the ability of drivers to travel on roads without anxiety. This report considers the effects of AHS introduction in order to corroborate the feasibility of both the AHS requirements for road traffic safety improvement established by the Ministry of Construction and the AHSRA and of a system that has been trial designed based on these requirements. Specifically, a trial design of (a hypothesis for) a system that satisfies established requirements is followed by a calculation of the degree that the introduction of this system would actually reduce accidents. The potential of an AHS to reduce accidents is calculated by multiplying this degree of effectiveness by the number of accident fatalities or injuries prevented by the AHS. (A*)
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