Women-only train cars

According to a survey conducted in Tokyo last year, nearly 64 percent of Japanese women in their 20s and 30s said they've been groped on trains, subways or at transit stations in the city.
These subway gropers -- who lean, rub and pinch during the remarkably crowded rush hours -- are known in Japanese as "chikan."

The solution found by Japanese: women-only train cars! Oh these little perverts...