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1) Number of accidents by type of poor maintenance (2000-2004)
There are numerous accidents in which poor maintenance was not the primary cause, and therefore was not recorded as a legal offense, but nevertheless was a contributing factor. Accordingly, inadequate-maintenance accidents (1 to 12 in Table 4) taken up here far outnumber those reviewed in the preceding Section 2.
The number of poor-maintenance accidents under this category during the last 5 years peaked in 2001, and has been more or less on the decline since then. By type, accidents to which ｡ﾈfaulty tires｡ﾉ contributed run approximately 70% each year, followed by those aggravated by ｡ﾈfaulty brakes｡ﾉ, about 10%. There is little year-to-year variance in this tendency. (Table 4 and Figure 4)
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2) Poor-maintenance accidents by vehicle type (2004)
A review on poor-maintenance accidents by type of vehicle involved shows that ordinary-sized passenger cars accounted for the most, at 590 accidents (53.1% of all vehicles), followed by ordinary-sized trucks at 131 accidents (11.8%), motorcycles and mopeds at 135 accidents (12.1%), light trucks at 98 accidents (8.8%), and light passenger cars at 95 accidents (8.5%).
The ratio of poor-maintenance accidents compared to the total was large among large-size cargo carriers (including trailers). (Table 5 and Figure 5)
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3) Pattern of accidents in which faulty tires are involved (2004)
Accidents in which ｡ﾈfaulty tires｡ﾉ are involved, which account for a large portion of all poor-maintenance accidents, are examined by accident patterns. Although some variations exist depending on the type of vehicle, vehicle-to-vehicle rear-end crashes numbered 187 cases, taking up about 27%, while solo-vehicle accidents totaled 210 cases, or approximately 30%. (Table 6 and Figure 6)
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4) Faulty-tire accidents (2004)
Faulty-tire accidents may be subdivided into ｡ﾈuse of summer tires on snowy road｡ﾉ (433 accidents), ｡ﾈflat tires and tire blowouts｡ﾉ (127 cases), and ｡ﾈworn tires｡ﾉ (69 cases). Accidents in which the use of summer tires under snowy conditions was a contributing factor fell significantly from 500 such cases in the preceding year to 433. (Table 7 and Figure 7)
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