2. Accidents In Which Inadequate Maintenance Was A Legal Offense
  1) Number of accidents caused by inadequate maintenance, where cars (including mopeds) were the primary party

  We focused on accidents that could have been prevented if drivers and riders had undertaken regular maintenance work before getting into the car (inadequate-maintenance accidents). Here, inadequate maintenance refers to the legal offense that was the primary cause of the accident. For example, if a car slips due to a faulty tire or tires, skids into the neighboring lane (violating traffic lane divisions) and causes an accident, that accident is classified under
"inadequate maintenance" as the main legal offense involved.

  Inadequate-maintenance accidents totaled 160 in 2004, down about 37% from 253 such accidents in 1994, showing
a downward trend as indicated in Table 2 and Figure 1.

Table 2  Shift in the Number of Inadequate-Maintenance Accidents
Figure 1  Shift in the number of inadequate-maintenance accidents (Index
  2) Breakdown of inadequate-maintenance accidents by vehicle type (2004)

  Of the 160 accidents in which inadequately maintained vehicles were the primary party, private-use passenger cars numbered 68, accounting for 42%, followed by private-use trucks, 24% at 39 accidents, motorcycles and mopeds,
19% at 30 accidents, and commercial-use trucks, 13% at 20 accidents. (Figure 2)
Figure 2  Breakdown of inadequate-maintenance accidents (primary party: cars, etc.) by type of vehicle (2004)
  3) Shift in the number of fatal accidents caused by inadequate maintenance

  Of the fatal accidents caused by inadequate maintenance of the primary party, the majority of primary parties were cargo carriers. In particular, heavy-duty cargo carriers triggered 12 such accidents during the 11 years, accounting for about 30% of the total. (Table 3 and Figure)
Table 3  Shift in the Number of Fatal Inadequate-Maintenance Accidents
Figure 3  Shift in the number of fatal inadequate-maintenance accidents

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Institute for Traffic Accident Research and Data Analysis (ITARDA)