Hirohima1973 comments

A driver who violate speed limit within 30kph in common streets/40kph in expressways doesn't have to pay for penalty ticket immediately if you feel the speed trap is not fair i.e. less traffic,no pedestrians,and ridiculously slow speed limit.

See the back side of the ticket which you receive when violating,police declares that,printed not in English but in Japanese only. All you have to do is wait for a letter from police,and ignore it,then again they'll send another letter,ignore it,and continue this until the public prosecutors office will order you an appearance. In this time you must respond this order ringing them up instead of actual attendance avoiding a summary proceeding and tell them"I want a regular trial". Most of >96% trifle traffic violation will be dropped and you will not obliged to pay for it anymore.