They are, but with restrictions. For example, 53 ft. trailers aren't allowed without a permit.
57 ft ÷ 3 ft/yd = 19 yd
57 ft 2 inches equals 686 inches.
4.75 ft.
8 ft wide
Typical length for five axle unit consisting of a sleeper berth tractor and single 48 - 53 ft. trailer will be between 67 and 77 ft. in total length. With a Kenworth W900L and 53 ft. stepdeck, I totaled 77 feet in length. A typical fleet truck will have a wheelbase between 210 and 240 inches. In some states, 57' trailers are allowed to be used without requiring a permit, adding another four feet to the total length of the truck.
4 ft 9 inches is 57 inches.
About 1.7 meters.
57/(2 pi) ~9.07
Area: 43*57 = 2451 square feet Perimeter: 43+57+43+57 = 200 feet
3 fett = 1 yard so 57 feet = 57/3 = 19 yards.
19 yd