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Question:

You must maintain a constant speed when passing and reentering the lane in front of trucks or buses, because trucks and buses require

A longer distances to slow down than cars.
Explaination

Because of their size, trucks and buses always need greater distances to slow down. You should maintain a constant speed when passing or reentering the lane in front of trucks or buses. If you pull in front of a truck or bus and then slow down suddenly, you might get rear-ended.