Are motorcycles with an engine displacement of less than 125 cc allowed on expressways?

Motorcycles with an engine displacement of less than 125 cc are not permitted on expressways in Japan. This regulation is in place to ensure safety and manage traffic flow on high-speed roads. Vehicles allowed on expressways are typically required to meet certain performance standards, including speed capabilities, which smaller motorcycles may not efficiently achieve. By limiting expressway access to motorcycles with larger engine displacements, the authorities aim to reduce the risk of accidents and maintain smoother traffic dynamics.