The increasing motorization of Japan, with current nationwide ownership surpassing 75 million cars, is worsening
the nation's traffic congestion and becoming a major social issue. More specifically, vehicle trouble due to
inadequate maintenance has brought about unexpectedly serious accidents, and vehicle failure has led to major
traffic jams, which in turn have caused traffic accidents. To lessen the number of accidents brought on by
inadequate vehicle maintenance, we need an understanding of the actual conditions. Here we have analyzed
the statistics and status of accidents that have been caused by inadequate vehicle maintenance, utilizing data from
traffic accident statistics (macro statistics) and from traffic accident case studies (micro surveys).
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