youdontknowme Really all depends on how much empty space your country has.
I don't think the amount of empty space has really anything to do with it, rather the government regulations and such. Although most of our "cities" are rather small (around 20k - 50k) on the big perspective... Maybe it has more to do with the fact, that we are better drivers that average π€£ (more WRC and F1 champions per capita than any other country!)
Sin ours have kangaroos on them occasionally!
And ours have moose and reindeers! Very rarely, even another cars have been reported to be seen, but I'm a little sceptic of those reports...