If the data of the bar diagram is represented by a pie-chart, and the angle of a sector of the pie-chart is 36°, then this sector represents the accidents involving.

$$\eqalign{ & \therefore {360^ \circ } = 1000{\text{ Accidents}} \cr & \,\,\,\,\,{1^ \circ } = \frac{{1000}}{{{{360}^ \circ }}} \cr &\,\,\,\,\, {36^ \circ } = \frac{{1000}}{{{{360}^ \circ }}} \times {36^ \circ } \cr & \,\,\,\,\,\,\,\,\,\,\,\,\, = 100{\text { Accidents}} \cr} $$
It is the accidents of Stationary vehicles