Houston is relatively close to Louisiana and forms part of the Interstate 10 corridor, a thoroughfare that runs across the United States. There are therefore a lot of truckers on the roads who frequently cross state lines to conduct business. These truckers may be subject to federal rules, including rules governing how long they can stay on the road before being required to take an extended break.
Safety features in passenger cars have been getting steadily better over the years, and inventions such as airbags have saved countless lives. However, there's only so much an airbag or a seatbelt can do when a car collides with a much larger and heavier vehicle. That is why trucking accidents are so dangerous. A collision that might have led to minor injuries if it were between two cars can easily lead to catastrophic or fatal injuries if one of the vehicles involved is a tractor-trailer truck or a large bus.