The terms semi-truck and 18 wheeler are often used interchangeably, but there is a difference between the two. A semi truck is actually the tractor unit of a large truck, while an 18 wheeler refers to the combination of the tractor and its trailer.
Semi Trucks are smaller than 18 wheelers and usually consist of a single trailer. These trucks can be seen on highways across America and are one of the most common types of commercial vehicles used to transport goods.
They’re typically powered by diesel engines, and they range in size from two to five axles. Most semi trucks have a maximum weight capacity of around 80,000 pounds, though some can carry up to 120,000 pounds.
18 Wheelers are bigger than semi trucks and are composed of both a tractor unit and a trailer. These vehicles usually have six or seven axles with four tires on each axle.
The total weight for this type of truck can be up to 80,000 pounds for just the tractor unit and an additional 30,000-40,000 pounds for the trailer depending on its size. This means that an 18 wheeler has a maximum load capacity of up to 120,000 pounds when fully loaded.
The main difference between semi-trucks and 18 wheelers is size – an 18 wheeler is bigger than a semi truck due to its larger load capacity. Additionally, while both types of vehicles are primarily used for long-distance transportation purposes, 18 wheelers are more common on highways as they can carry heavier loads than a typical semi-truck.
In conclusion, while both terms may be used interchangeably in conversation, there is indeed a difference between a semi-truck and an 18 wheeler: an 18 wheeler has more axles and tires than a semi truck as well as being capable of carrying heavier loads.
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