Expect traffic hell in Manhattan this weekend.

About 120 blocks around the borough are scheduled for street closures Saturday.

Car Free Earth Day will take more than 30 blocks of Broadway between 17th and 47th streets and nine blocks of St. Nicholas Avenue between 181st and 190th streets, while the March for Science will shut down Broadway from 47th Street to Columbus Circle and Central Park West from Columbus Circle to 86th Street, as well as chunks of 61st, 62nd, 64th, 71st and 72nd streets.

There’s also the Sikh Cultural Society annual parade and festival, the Chelsea Jewish Center’s Sixth Avenue Festival and the 27th Annual Upper Broadway Spring Festival.

Marchers will take up Madison Avenue from 24th to 38th streets, along with adjacent blocks on 36th, 37th, and 38th streets.

The Chelsea Jewish Center will be using Sixth Avenue between 23rd and 32nd streets.

Things won’t be much better on Sunday, when Manhattan will host an immigrants’ rights march, the West Side Spring Festival and the 911 Memorial 5K.