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Is 209 microns as long as a Semitrailer?

It's about one-seventy-thousandth as long as a Semitrailer
The length of a Semitrailer is about 14,630,000 microns.
(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 14,630,000 microns (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
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