Maybe this will lead to speed limit reform in Japan. There is a legal requirement that the police need to prove that someone is definitely speeding, so police

Maybe this will lead to speed limit reform in Japan. There is a legal requirement that the police need to prove that someone is definitely speeding, so police and automated speed cameras both allow speeding 15-20km over posted speed limits, which means that de jure speed limits are all set 20km under the de facto speed limit.