Semi-trailer truck

High school (ages 12+)
Transportation

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/semi-trailer-truck

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary function?Long-haul freight transportation, forming the backbone of supply chains
2. What is the technological advancements?Ongoing development includes alternative fuels, autonomous driving, and enhanced safety features
3. How does the tractor connect to the trailer?The tractor uses a fifth wheel, a saddle-shaped coupling, that locks onto the trailer’s kingpin. This lets the truck turn and move while keeping the trailer attached safely.
4. Why do semi-trailer trucks have different types of trailers?Different trailers, like dry vans, reefers, and tankers, are made to carry different kinds of goods. For example, reefers keep food and medicine cold, and tankers carry liquids or gases.

Tractor Unit: The powered vehicle containing the engine, driver's cab, and fifth wheel coupling.
Semi-trailer: The unpowered cargo-carrying unit that relies on the tractor for support and propulsion.
Fifth Wheel Coupling: A specialized, robust hitch system enabling articulation and secure connection between tractor and trailer.
Kingpin: A heavy-duty pin on the semi-trailer that locks into the tractor's fifth wheel.