noun
hitchhiker
A person who travels by getting free rides from passing vehicles.
彼はヒッチハイカーを拾ってあげた。
He picked up a hitchhiker.
高速道路の入り口にヒッチハイカーが立っていた。
A hitchhiker was standing at the entrance to the highway.
ヒッチハイク is the act of hitchhiking (noun/suru-verb), while ヒッチハイカー refers to the person doing it.
Loanword from English 'hitchhiker'.