Language barriers during police stops can escalate minor incidents into dangerous misunderstandings.
An app with pre-loaded "know your rights" scripts translated into local dialects, with pronunciation guides and quick-access buttons for critical phrases ("I want my lawyer" in Tokyo dialect).
MVP: Focus on one high-tourism corridor (e.g., Tokyo-Osaka) with 20 essential phrases.
Risk: Legal liability if translations are inaccurate in consequential situations.