If you are a victim
(1)    Report the accident to the police immediately. If the accident is not reported to the police, the Kotsu Jiko Shomei-sho (Proof of a Traffic Accident), required to receive insurance payments due to a traffic accident, may not be obtainable.
(2)    Confirm the address and name of the driver and the owner of the vehicle (when the driver is not the owner), and also the vehicle registration number, date of insurance entry and name of insurance company.
(3)    Even if you think your injury is minor, have a medical check-up.


If you caused an accident
(1)    Help the victim (give first-aid, call an ambulance).
(2)    Notify the police.


Note 1 　For details, ask a person who understands Japanese to enquire for you at a nearby police station or your city, ward, town or village office.

Note 2 　The information given is that confirmed as of July 2002. Note that a new system or system revisions may have been introduced after this date.

This information is from the CLAIR website. The Council of Local Authorities for International Relations (CLAIR) was established in July 1988 in response to rising concerns about local level internationalization in Japan.