> most accident are in the 15 Km around the drivers' home (probably because the driver feel "safer" because he knows the road)
A 15km radius from my house would nearly cover all but the most far-flung areas of the medium-sized city that I live in. The vast majority of my driving would be within that radius, so it's not surprising the majority of my driving accidents would be within that radius.
Just for reference, a disk with a radius of 15km would have an area of 700km². You could compare that with the area of Chicago (590km²) or New York City (780km²).
A 15km radius from my house would nearly cover all but the most far-flung areas of the medium-sized city that I live in. The vast majority of my driving would be within that radius, so it's not surprising the majority of my driving accidents would be within that radius.
Just for reference, a disk with a radius of 15km would have an area of 700km². You could compare that with the area of Chicago (590km²) or New York City (780km²).