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  2. Tractor unit - Wikipedia

    en.wikipedia.org/wiki/Tractor_unit

    Peterbilt 386 sleeper-cab–style commercial 6×4 tractor unit. A tractor unit, also known as a truck unit, lorry unit, power unit, prime mover, ten-wheeler, semi-tractor, semi-truck, semi-lorry, tractor cab, truck cab, lorry cab, big rig tractor, big rig truck or big rig lorry or simply a tractor, truck, lorry, semi, big rig or rig, is a characteristically heavy-duty towing engine that ...

  3. Dolly (trailer) - Wikipedia

    en.wikipedia.org/wiki/Dolly_(trailer)

    It is designed to couple to the concerned automobile's powered wheel, i.e. the front wheel of a Front-wheel drive automobile, or the rear wheel of a rear-wheel drive automobile, by locking the powered wheels onto the tow dolly's tray. The tow dolly is tow hitch connected to a tractor or truck. Tow dollies are legal in all 50 US states and Canada.

  4. Ballast tractor - Wikipedia

    en.wikipedia.org/wiki/Ballast_tractor

    The ballast box is a metal box installed on the rear chassis of the tractor instead of the fifth wheel coupling. Earlier heavy haulers unmounted the fifth wheel and used merely a piece or two of heavy rocks, stones or concrete blocks which weighted enough to avoid wheel spin, [4] later builders and heavy haulers developed metal boxes of ...

  5. Semi-trailer - Wikipedia

    en.wikipedia.org/wiki/Semi-trailer

    A tractor unit pulling a semi-trailer A truck pulling a semitrailer using a trailer dolly. A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States). [1]

  6. Articulated vehicle - Wikipedia

    en.wikipedia.org/wiki/Articulated_vehicle

    In the UK, tractor unit and trailer combinations are referred to as articulated lorries, or "artics". [1]A semi-trailer truck, also known as a semitruck, [1] (or semi, [2] eighteen-wheeler, [3] big rig, [4] tractor-trailer [5] or, by synecdoche, a semitrailer) [6] [a] is the combination of a tractor unit and one or more semi-trailers to carry freight.

  7. Road train - Wikipedia

    en.wikipedia.org/wiki/Road_train

    In the United States, trucks on public roads are limited to two trailers (two 28 ft or 8.5 m and a dolly to connect; the limit is 63 ft or 19 m end to end). Some states allow three 28 ft or 8.5 m trailers, although triples are usually restricted to less populous states such as Idaho, Oregon, and Montana, plus the Ohio Turnpike [ 24 ] and ...