Filmed under the title Highway Patrol, Lippert's Motor Patrol stars Don Castle as Ken, a rookie policeman. When his fiancee's brother is killed by car thieves, Ken volunteers to bring in the murderers. He poses as a big-city racketeer and infiltrates the gang. After the inevitable unmasking, the film ends in a blaze of artillery. The film strives for a documentary "feel" by including long, detailed sequences dramatizing real-life police procedure. This being a Lippert Film, the presence of Sid Melton as comedy relief is inevitable.