Each prefecture adopts a system of classifying the fee into 'adults' (middle-school students or above), 'children' (elementary-school students) and 'infants' (babies and children under school age).
いずれの都道府県においても「大人（中学生以上）」「中人（小学生）」「小人（未就学乳幼児）」の料金分けを採用。