Maryland State Police were busy overnight Thursday inspecting commercial trucks and buses traveling on the Capital Beltway in Prince George’s County, suspending and even arresting some drivers.

The roadway has been identified as a “commercial vehicle high crash corridor,” authorities said, prompting the safety enforcement effort.

Recent fatal accidents involving intercity buses have drawn attention to the safety of commercial vehicles traveling the nation’s highways and their compliance with regulations.

Police inspected 351 vehicles at a temporary staging area located at FedEx Field as part of “Operation Tailgate,” authorities said, which was conducted with help from the state Department of the Environment, Montgomery County Police and the Calvert County Sheriff’s Office.

Troopers issued 108 tickets and 128 warnings. Thirty-five vehicles were pulled from service “due to serious equipment violations,” and 25 drivers were pulled for having false logbooks, driving more hours than permitted or not having the correct commercial license, police said. One bus driver was determined to be “medically unqualified,” they said.

Two drivers were arrested due to outstanding warrants, and a truck passenger was arrested for marijuana possession, police said.

U.S. Transportation Secretary Ray LaHood has described companies that fail to follow safety regulations as “a serious threat to innocent travelers.”