Japan introduces private parking monitors under revised Road Traffic Act

On 1 June 2006, a revision of Japan's Road Traffic Act took effect that changed how illegal street parking was policed. Until then, enforcement relied mostly on police officers and traffic wardens, who could not cover the huge number of violations in dense urban areas, and many drivers simply left cars briefly at the roadside.

Under the new system, private companies registered with the authorities could employ parking monitors. In designated areas, these monitors checked for illegally parked vehicles and attached a notice, usually a conspicuous marker, to the car. Police then handled the follow-up. This freed officers for other duties and greatly increased the number of vehicles checked.

The revision also shifted responsibility. If the driver could not be identified, the vehicle's registered keeper could be required to pay an administrative fine, so leaving a car and walking away no longer worked as a way to avoid penalties.

The change mattered most in cities such as Tokyo, where narrow streets and heavy traffic made roadside parking disruptive. It is widely seen as a turning point that made illegal parking much less common and reinforced the need for legal, off-street parking options.