BOSTON (CBS) – Several roads will be closed Wednesday for the memorial service for slain MIT police officer Sean Collier.  It is not open to the public.

Here is what you can expect:

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Vassar Street:

Closed beginning at 6 a.m. on Wednesday, April 24 between Audrey St. and Massachusetts Ave.

Massachusetts Avenue:

Closed from Albany St. toward Boston beginning at 7 a.m. on Wednesday, April 24.

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Memorial Drive:

Closed beginning at 12 a.m. on Wednesday, April 24 between Massachusetts Ave. and the B.U. Bridge.

Massachusetts Avenue Bridge into Cambridge closed beginning at 7 a.m. on Wednesday, April 24.

These road closures are going to have a major impact on traffic in the city. Police are asking residents to plan ahead, seek alternate routes, and use public transportation whenever possible.

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Information can also be found by following @MassStatePolice and @CambridgePolice on Twitter.