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When driving a commercial vehicle with a height over 13 feet, you should

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Explaination
Don't try to drive your CMV under a bridge or overpass unless you're sure you have enough vertical clearance. Some CMVs are more than 13 feet tall. Many Western states allow CMVs to be even taller. Always know the height of the vehicle you're driving, but be aware that once unloaded, the height of your vehicle may increase.