新幹線の客室に付いてる、トイレのインジケーターは、トイレが使用中だとランプが点くので、トイレまで行かなくても判るので、インジケーターが消えてる時にトイレに向かえば、トイレの前で待たなくて済むのでスマートですね。^^ The restroom indicator in the Shinkansen cabin lights up when the restroom is in use, so you don't have to go to the restroom to see if it is in use. It is smart to head to the restroom when the restroom indicator is off so you don't have to wait in front of the restroom. :)