未就学児・高齢者（70歳以上）障害者及び介護の方は無料 って英語でなんて言うの？
バスや電車などの公共交通機関の運賃が無料という状況です。
回答
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The fare for preschoolers, the elderly (70 years and over) and people with disabilities or receiving nursing care is free.
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The fee for preschoolers, the elderly (70 years and over) and people with disabilities or receiving nursing care is free.
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Preschoolers, the elderly (70 years and over) and people with disabilities or receiving nursing care ride for free.
公共交通機関 = 'fare'. “fee” といえば公共通機関じゃなくて、公の施設の場合で使います。
'ride for free' = 無料で乗ります
イギリス 
