When something like a school bus starts turning, the front wheels will go where they’re pointing, but the rear wheels act as a pivot point. If the wheels are all the way at the back of the bus, then it would be making very wide turns.
School busses in particular need a tighter turning radius than most other vehicles their size. A transport truck generally drives on major roads and highways between warehouses and stores. A school bus drives on residential streets, making lots of turns to cover a large area.
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