This note is part of the regulatory structure analysis for the Quiet Towns Project. For a discussion of the siloed regulatory structure, see Why Loud Motorcycles Aren't Caught. The complete hypothesis overview is summarized in Four Research Hypotheses.
What Is Happening
Motorcycles and automobiles fitted with illegally loud exhaust systems continue to travel on public roads. Policymakers and some experts have repeatedly asked whether industry self-regulation could solve the problem. Yet self-regulation has never worked.
Attributing this to a moral failure is a mistake. Noise-producing vehicles remain in circulation because the industry is internally fragmented into multiple interest groups, and each group can plausibly claim that self-regulation is "somebody else's problem." What appears from the outside to be a single culprit is, in reality, a disparate coalition with no shared interest.
Background and Context
The vehicle-noise industry comprises at least four distinct tiers.
The first tier is finished-vehicle manufacturers. Automakers affiliated with the Japan Automobile Manufacturers Association (JAMA) ship vehicles that have passed type approval under the Road Transport Vehicle Act (Japanese: 道路運送車両法). At this stage, noise standards are met. Manufacturers bear no legal responsibility for modifications made after type approval.
The second tier is aftermarket parts manufacturers. Industry bodies such as the Japan Automotive Sports Muffler Association (JASMA; Japanese: 日本自動車スポーツマフラー協会) operate conformity-certification programs, yet non-certified products also reach the market. Moreover, for products explicitly labeled "not for public roads" or "competition use only," responsibility for subsequent public-road use is ambiguous.
The third tier is dealerships and repair businesses. The Ministry of Land, Infrastructure, Transport and Tourism and thirty-three automotive-related organizations run an annual campaign to eliminate illegal vehicle modifications, yet in practice some repair businesses continue to install illegally loud exhaust systems. The fact that street-inspection arrest numbers hold steady at a limited figure each year illustrates the ceiling of enforcement.
The fourth tier is user communities. Within owners' clubs and track-day participants, a subculture has formed in which high volume is experienced and shared as part of the enjoyment.
Reading the Structure
Why this four-tier structure blocks self-regulation is straightforward: each tier has a ready argument for why it is complying.
Finished-vehicle manufacturers can say, "Our vehicles met standards at the type-approval stage." Parts manufacturers can say, "We labeled them competition-only." Dealerships can say, "We decline to install them"—and those that do not decline become an enforcement problem to be addressed separately. Users can interpret the situation as "I haven't been cited, therefore it's legal."
When this logic of "closing responsibility within one's own domain" operates simultaneously across all four tiers, a state emerges in which no one bears responsibility for the whole. The administrative jurisdictional fragmentation analyzed in Regulatory Gaps and the internal interest fragmentation within the industry are mirror images of each other. Just as administrative agencies can say "outside our jurisdiction," each industry tier has a matching structure that lets it say "not our problem."
For industry-wide self-regulation to function, an incentive design is needed in which each tier shares responsibility for the entire chain. That incentive does not currently exist. Finished-vehicle manufacturers can rationalize that noise increases from aftermarket parts have nothing to do with their products' reputations. Parts manufacturers can treat it as the customer's problem when a "competition-only" product is used on public roads. Everyone is partially correct, yet the problem as a whole goes unsolved.
References
Campaign to Eliminate Illegal Modifications (Street Inspection and Maintenance Order Implementation Status) — Ministry of Land, Infrastructure, Transport and Tourism. Ministry of Land, Infrastructure, Transport and Tourism
Road Transport Vehicle Act (Act No. 185 of 1951) — e-Gov Legal Information Search. Digital Agency of Japan
Noise Regulation Act (Act No. 98 of 1968) — e-Gov Legal Information Search. Digital Agency of Japan
Environmental Noise Guidelines for the European Region — World Health Organization (WHO). WHO Regional Office for Europe
Environmental Quality Standards for Noise (Ministry of the Environment Public Notice No. 64) — Ministry of the Environment. Ministry of the Environment