The New York City Police Department has announced street closures and security measures that will be in effect during the annual Rockefeller Center Christmas Tree Lighting Ceremony tonight.

Because heavy traffic is expected, drivers should avoid the vicinity of Rockefeller Center and Radio City Music Hall from 3 p.m. to midnight. Anyone attending the event is encouraged to use mass transit.

The following streets will be subject to closure from 3 p.m. until the conclusion of the event: 48th, 49th, 50th, and 51st streets between Avenue of the Americas and Madison Avenue, 47th Street between 5th Avenue and Madison Avenue, and 52nd Street between 5th Avenue and Madison Avenue.

• 48th to 51st Street between Avenue of the Americas and Madison Avenue

• 47th Street between 5th Avenue and Madison Avenue

• 52nd Street between 5th Avenue and Madison Avenue

Effective Thursday, Nov. 30 until Tuesday, Jan. 2, 2018, the following streets will be closed to vehicle traffic on weekdays from 5 p.m. until midnight, and on weekends from 1 p.m. until midnight.

• 49th Street between 5th and Avenue of the Americas

• 50th Street between 5th and Avenue of the Americas