3. Type of vehicle of the primary party
   In the following sections, we look at the driving behavior causing a traffic accident and therefore deal with only the primary parties, the more negligent of the two parties involved in an accident.

  Figure 6 shows how many drivers have caused traffic accidents as the primary party for each type of four-wheeled vehicle. There has been an increase in female drivers from only about 1/5 the number of male drivers in 1984 to nearly 1/2 in the last few years. The same data is shown in Fig. 7 in percentage terms. While standard-sized passenger cars constitute the largest portion every year, mini-sized passenger cars started to rise around 1990, reaching 14% for males and as much as 40% for females in 2008, and are estimated to continue rising in the future. In view of the very
small number of senior female drivers in the accident year 1984 (see Fig. 5), we deal exclusively with male drivers of standard- and mini-sized passenger cars in the following sections.

Fig. 6: Number of primary parties driving a four-wheeled vehicle by vehicle type:Males

Fig. 6: Number of primary parties driving a four-wheeled vehicle by vehicle type:Females

Fig. 7: Proportion of primary parties driving a four-wheeled vehicle by vehicle type:Females

Fig. 7: Proportion of primary parties driving a four-wheeled vehicle by vehicle type:Females

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Institute for Traffic Accident Research and Data Analysis (ITARDA)