Large trucks are most likely to lose speed and cause a hazard:

On straight, flat highways.
Going up long or steep hills.
Going down long gradual hills.
On long, gradual curves.
Explanation

Large trucks can lose speed quickly when they are going up long or steep hills. This can create a hazard for other vehicles on the road. To be safe, always allow more space between you and the large truck in front of you when going up a hill, and be prepared to slow down if the truck loses speed.

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