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Federal regulators said they shut down 52 bus companies and placed 340 vehicles out of service as part of an eight-month intensified effort to shut down unsafe motorcoach companies.

The enforcement crackdown, part of the Federal Motor Carrier Safety Administration’s “Operation Quick Strike,” was conducted from April through November and featured more than 50 specially ed investigators conducing in-depth reviews into the patterns and practices of 250 “at-risk” motorcoach companies, the Department of Transportation said in a Dec. 12 statement.

Companywide failures to adequately maintain their buses, inadequate drug-and-alcohol driver-testing programs and widespread hours-of-service violations were among the reasons companies were shut down.