A semi, or semi-truck, is a large vehicle designed to haul cargo. It is usually comprised of a tractor unit and one or more trailers.
The trailer is connected to the tractor unit by a fifth wheel coupling. The tractor unit is also known as a cab or cab-over engine (COE). Semi-trucks are used for long-distance hauling of goods and materials, and are commonly seen on highways and interstates.
Semi-trucks can be classified as either trucks or tractors, depending on their usage. Trucks are typically used for short haul applications, such as local deliveries and moving goods from one city to another. Tractors are typically used for long haul applications, such as transporting goods over state lines or even across the country.
The main difference between a truck and a tractor is the size and weight of the cargo they are capable of carrying. Trucks are designed to handle smaller loads than tractors. For example, a typical semi-truck can carry up to 80,000 pounds of cargo while a tractor can carry up to 200,000 pounds.
When it comes to overall design, trucks usually have higher seating positions so that drivers can better see ahead while driving. Tractors also have higher seating positions but they usually have larger engines that provide more power compared to trucks. Additionally, tractors tend to be equipped with additional features such as air brakes and power steering that help with maneuvering large loads.
In conclusion, it depends on the type of application for which it will be used whether a semi-truck should be classified as either a truck or tractor. For short haul applications where smaller loads need to be transported, then a truck will suffice. On the other hand, if longer distances need to be covered and heavier loads need to be transported then it’s best to opt for a tractor unit instead.