The authors model the emergence processes of road obstacles, such as fallen objects on roads, the deformation and destruction of\r\npavements, and the damage and destruction of road facilities, as counting processes. Especially, in order to take into account the\r\nheterogeneity of the emergence risk of a variety of road obstacles, the authors model a mixture Poisson process in which the arrival\r\nrate of road obstacles is subject to a probability distribution. In detail, the authors formulate a Poisson-Gamma model expressing\r\nthe heterogeneity of the arrival rate as a Gamma distribution and formulate the management indicator of the emergence risk of\r\nroad obstacles. Then, a methodology is developed in order to design a road patrol policy that can minimize the road obstacle risk\r\nwith a limited amount of budget. Furthermore, the authors empirically verify that it is possible to design road patrol policy based\r\non the emergence risk of actual road obstacles with the proposed methodology, by studying the cases of the application of the\r\nmethodology to general national roads.
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