Japan's revised law clarifying dangerous driving takes effect

Japan has implemented a revised law aimed at toughening penalties for dangerous driving that leads to fatalities or injuries. Effective July 21, 2026, the legislation introduces clearer, numerical standards for offenses like speeding and driving under the influence of alcohol.

Under the new rules, "high speed" is defined as exceeding the speed limit by at least 50 km/h on regular roads and 60 km/h on highways. For drunken driving, a breath alcohol level of 0.5 mg per liter or higher is now the threshold. These precise metrics are intended to simplify the process for authorities to prove dangerous driving, moving beyond the previous challenges of demonstrating deliberate intent in some cases, which often resulted in lesser charges of negligent driving.

Dangerous driving offenses under the revised law carry a maximum prison sentence of 20 years. However, the law also acknowledges that even speeding below these new numerical standards could still be considered dangerous in specific contexts, such as driving in areas frequented by children or on icy roads, where heightened caution is expected.