18-wheeler

English frame|right|Side view and underside view of a conventional 18-wheeler semi-trailer truck with an enclosed cargo space. The underside view shows the arrangement of the 18 wheels. Shown in blue in the underside view are the axles, drive shaft, and differentials. The legend for labeled parts of the truck is as follows: 1. tractor; tractor unit 2. semi-trailer (detachable) 3. engine compartment 4. cabin 5. sleeper (not present in all trucks) 6. air dam 7. fuel tanks 8. fifth wheel coupling 9. enclosed cargo space 10. landing gear - legs for when semi-trailer is detached Alternative forms en eighteen-wheeler Etymology From the total number of wheels: two front steering wheels on the tractor, plus dual wheels on each end of two axles (total of 8) at the rear of the tractor and supporting the front of the trailer, plus dual wheels on two axles at the rear of the trailer. Noun A big rig truck: a semi-trailer plus the truck or tractor pulling it. en semi-trailer truck semi truck semi articulated lorry artic big rig juggernaut tractor-trailer truck and trailer en https://time.com/7339685/person-of-the-year-2025-ai-architects/ Time 11 December 2025 Charlie Campbell, Andrew R. Chow and Billy Perrigo The Architects of AI Are TIME’s 2025 Person of the Year On a cold morning in Abilene, Texas, a column of 18-wheelers crawls down bumpy, waterlogged roads, past cattle grazing on dusty shrubs. https://web.archive.org/web/20260928075844/https://time.com/7339685/person-of-the-year-2025-ai-architects/ 28 September 2026 Translations a big rig truck: a semi-trailer plus the truck or tractor pulling it semi-trailer truck en Eighteen Vehicles