Troopers are also looking for truck and bus drivers who aren't supposed to be on the road.
The Texas Department of Public Safety's Tom Vinger says they inspected about 8000 vehicles in Texas during last year's effort. They found over 26 percent had serious violations.
"There are very stringent requirements on commercial motor vehicles and drivers. They face much tougher regulation than a passenger vehicle does, for obvious reasons."
Vinger says troopers are looking for things like broken tail lights and faulty brakes. They're also looking for commercial drivers whose log books aren't up to date, or who don't have the proper license. And even though drivers have been warned about the effort, Vinger says there's still a random element.
"Because in each area of the state, the weigh stations will be open at different times, so they really don't know exactly when they'll be open."
The effort also targets drivers of passenger vehicles who drive aggressively, creating a dangerous situation for buses and big rigs.
"People cut in front of them, they drive in their blind spots, they hit their brakes. Commercial motor vehicles obviously are larger. They can't stop as quick."
The ramped-up enforcement effort runs through Thursday.