Motorists bracing for Carmageddon II can get a little practice over the next two weekends, with briefer closures scheduled for a portion of the San Diego (405) Freeway.

Transportation officials have been working to alert drivers that the 405 through the Sepulveda Pass will close this weekend for workers to prepare the final demolition phase of the Mulholland Bridge.

The northbound 405 between Getty Center Drive and Ventura Boulevard is scheduled to close at 11 p.m. Saturday through 9 a.m. Sunday. The closure of the Mulholland Bridge is slated for 10 p.m. Friday through 8 a.m. Sunday.

Then the following weekend, Mullholland Drive, from the west side of the bridge to Casiano Road, is also scheduled to be closed 10 p.m. Sept. 21 at 10 p.m. to 6 a.m. Sept. 24.

The work is in anticipation of Carmageddon II, the second phase of major work on the 405 that began last summer.

Carmageddon II is set for Sept. 29-30 and will require the full 10-mile closure of the 405, in both directions, between the Santa Monica (10) and Ventura (101) freeways.

Ramps along the closure area are expected to shut down as early as 7 p.m. Sept. 28 with individual freeway lane closures beginning at 10 p.m. and reopening early in the morning on Monday, Oct. 1.