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Expect traffic “mayhem” on Manhattan streets Thursday.

The combination of President Barack Obama's fundraisers tonight in Battery Park City and in the West Village — his fifth NYC visit since March, Gov. Hugh Carey's funeral and Mets and Yankees day games will cause an “all-day traffic marathon,” “Gridlock” Sam Schwartz warned Wednesday.

“It’s going to be a mess. It’s going to absolutely be mayhem on the roads,” Schwartz, the former traffic commissioner told amNewYork, noting that downtown — specifically near the World Financial Center — is likely to be most affected.

The evening commute will be particularly bad, with parts of the West Side Highway, the FDR Drive and the Battery Tunnel closed for Obama’s motorcade.

Drivers won’t get relief until about 10 p.m.

Schwartz said he couldn’t remember a day as busy with traffic, predicting today’s gridlock will be even worse than when Obama and teen idol Justin Bieber visited on the same day in June.

Here’s a list of events that are sure to cause traffic jams:

8 a.m. – Public viewing and funeral for Gov. Carey at St. Patrick’s Cathedral at Fifth Avenue between 50th and 51st streets.

12:10 p.m. – Mets vs. Padres at Citi Field.

1:05 p.m. — Yankees vs. Angels in The Bronx.

5:30 p.m. – Obama stops by Battery Park Ritz-Carlton fundraiser via the FDR.

7:30 p.m. – Obama heads to West Village fundraiser via the West Side Highway.

9:30 p.m. – Obama returns to JFK Airport.

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