Monday's fatal crash near Tokyo involving a 90-year-old driver again highlighted the problem of elderly motorists in a rapidly aging society.
Kumiko Saito was arrested on suspicion of negligence causing death and bodily injury as the car she drove in Chigasaki, Kanagawa Prefecture, hit four pedestrians, killing one.
Given the nation's rapidly graying population, police introduced tougher screenings in March last year, requiring those who are 75 or older to take a cognitive test when they renew their license or when they are ticketed for certain traffic violations.