Suffolk police Wednesday announced several road closures — beginning at 5 a.m. — in preparation for the Donald Trump fundraiser Thursday at The Emporium, a Patchogue nightclub.

Most will begin at 2 p.m. but Suffolk Police Commissioner Timothy Sini warned that police will be preparing “all day,” so limited restrictions on all roads in the surrounding area should be expected.

The first closure will take place at 5 a.m. on Railroad Avenue between Main Street and South Street.

Beginning at 9 a.m., Railroad Avenue will be closed between Main Street and Sephton Street. South Street, Church Street, Sephton Street and Gerard Street will be closed as of 2 p.m.

Church Street between Railroad Avenue and Ocean Avenue will be open to emergency vehicles and residents. The same goes for Gerard Street from West Avenue to South Ocean Avenue.

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The municipal parking lot on the west side of South Ocean Avenue in the rear of the Emporium as well as the Long Island Rail Road parking lot on Sephton Street will be closed as of 9 a.m. Any vehicles remaining on streets or in parking lots after the closures will be towed. Towed vehicles will be taken to the Village of Patchogue Department of Public Works Garage, located at 216 Waverly Ave. in Patchogue.

Motorists are advised that all parking rules and restrictions will be in effect. Motorists must park legally or will risk being ticketed or towed, police said.