Years after their unorthodox days patrolling the Vermont highways, the former Vermont state troopers—Thorny, Rabbit, Mac, Farva, and Foster—find themselves running a
roadside diner. Their tranquil civilian lives are abruptly shattered when Captain O'Hagan arrives with startling news: as part of a messy international border realignment, a disputed patch of land currently belonging to Quebec, Canada, is officially reverting to the United States. Governor Jessman drafts the legendary, dysfunctional crew back into active duty to establish a new state police detachment in the newly acquired territory, aiming to prove they are still capable lawmen.Upon arriving at the freezing outpost, the troopers discover their new jurisdiction is thoroughly hostile. The local Canadian residents deeply resent their sudden annexation, and the incumbent local Royal Canadian Mounted Police—led by the arrogant Mounties Renaud, Gagnon, and Bellefeuille—instantly wage a psychological war against the American interlopers. Compounding their mission, Captain O'Hagan falls instantly infatuated with Genevieve Aubois, the smooth-talking French-Canadian cultural attaché helping manage the transition.Determined to assert dominance, the troopers dive into their standard, chaotic brand of policing. They antagonize local speeders, conduct bizarre sobriety tests, and clash continuously with the condescending Mounties through escalating pranks and turf wars. However, the mission quickly turns serious when Rabbit stumbles upon a massive, sophisticated smuggling ring operating right across the unguarded border. Uncovering a cache of illegal contraband, the troopers realize that corrupt elements within both the Canadian and American sides are using the bureaucratic border confusion to traffic illicit drugs and goods.Motivated by a desperate desire to secure their permanent reinstatement and redeem their tarnished reputations, the troopers launch a renegade investigation. They navigate a web of French-Canadian mobsters, secret tunnels, and double-crossing officials. Farva, desperate for validation, stumbles into key intelligence through sheer, accidental buffoonery.The climax erupts at a local winter festival. The troopers orchestrate an elaborate
sting operation to entrap the smugglers and expose the corrupt Mounties. Despite their usual incompetence and lack of tactical coordination, their unorthodox methods ultimately pay off. A chaotic firefight and high-speed chase ensue across the snow-covered border. The troopers successfully apprehend the criminals, saving the geopolitical transition from collapse. In the aftermath, cleared of doubt and having saved the day, the troopers are officially honored, cementing their legacy—not just as chaotic troublemakers, but as legitimate, albeit bizarre, heroes of the highway.