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parade float;festival float
川越の山車は、いわゆる鉾山車と呼ばれる形で、車輪が3つ、もしくは4つ付いています。
The Kawagoe festival float has the shape of what's called a hoko float. It has three, or four, wheels attached.
Other forms
花車 【だし】 (rarely used kanji form)