The kingpin locking mechanism on a semi-truck trailer is what allows thousands of big trucks to make shipments all across the U.S. Here's how it works.

There are several types of semi-trailers on the road that all serve a different purpose. Here are the main types and how they connect to the trucks.

The spikes on semi-truck wheels are covers that protect lug nuts from road debris. They may also encourage drivers to give trucks extra room on the road.

A News 3 crew spotted the semi-truck trailer on fire near the 44 mile marker in the northbound lanes on I-57. ... Flames were seen coming from the rear wheels of the trailer and spreading.