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Is 5 ells as long as a Semitrailer?

It's about two-fifths as long as a Semitrailer
The length of a Semitrailer is about 12.80 ells.
(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(DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 12.80 ells (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
There's more! See other comparisons to 5 ells...