You should not make sudden stops in front of large trucks and buses because:

Large vehicles require longer distances to stop and accelerate than smaller vehicles do. Making a sudden stop in front of a large vehicle is dangerous because the other driver may not be able to stop in time to avoid a collision.

• Small vehicle drivers cannot adequately see large trucks and buses in their rearview mirrors.
• Large trucks and buses, due to their size and weight, require longer distances to stop than smaller passenger vehicles.
• Large trucks and buses travel at a higher speeds than small vehicles.