"Safe Riding Rule Book for Bicycle Users"

Riding without the lights on in the night is illegal.

Lights of vehicles

Paragraph 1, Article 52 of the Road Traffic Law and Paragraph 1, Article 10 of Osaka Prefecture's Road Traffic Rules

Punishment: A fine of 50,000 yen or less
Any vehicles shall turn on its lights in the night time (the period from sunset to sunrise) when on a road.

With the head lights on, other pedestrians or vehicles can recognize me!