Slowing down is important. It mitigates a possible crash.
The aerodynamics of a boxy trailer do not lend themselves to downward forces sufficient to hld the trailer down. They are built with the freight (up to 46,000 lbs) to provide the downward force.
Areas prone to high winds, such as Laramie, WY along I-80 have light trailer bans in windy winter conditions due to the dangers.
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