WESTPORT — Police have issued traffic guidance for Sunday’s “CT United Ride,” the procession by thousands of motorcycles in tribute to victims of the Sept. 11, 2001, terror attacks.

The motorcade, with several thousand motorcyclists expected to participate, starts in Westport at Sherwood Island State Park and passes through town at the start of a 60-mile route that includes nine other communities before ending at Seaside Park in Bridgeport.

Motorcyclists are expected to leave Sherwood Island about 11:30 a.m. Sunday, head south on Interstate 95 to Exit 17 at Saugatuck Avenue, then head north onto Riverside Avenue to Wilton Road before continuing into Wilton.

Police warn the entire route through Westport is “closed and continuous,” as the motorcade — accompanied by a police escort — will not stop at traffic lights or stop signs.

Through traffic will not be allowed to cross the motorcade’s path at intersections along the route. The area will be “completely impassable until the entire procession clears,” police said in the traffic advisory.

It is expected to take at least 45 minutes for motorcyclists participating in the CT United Ride to complete the Westport segment of the route, police said.