Think of this weekend and next weekend as dress rehearsals for the big Carmageddon II show the weekend of Sept. 29-30.

This Friday night/Saturday morning, from 11pm to 9am, all southbound lanes on the 405 will be shut down from the 101 to Getty Center Drive. Next weekend, all northbound lanes on the same section of the 405 will be closed for the same hours.

Also, this weekend, from Friday 10pm to Sunday 8am, the Mulholland Bridge will be closed.

These two "baby Carmageddons" are in preparation for Carmageddon II on Sept. 29-30, when BOTH sides of 10 miles of the 405 will be closed for 53 hours while crews finish demolishing the Mulholland Bridge.

Although last year's Carmageddon finished early, that's not expected for Carmageddon II because more work needs to be done. In fact, LA County Supervisor Zev Yaroslavsky commented about Carmageddon II, "It's like 'Carmageddon' on steroids."

Carmageddon I and Carmageddon II are both part of the city's larger $1-billion Sepulveda Pass Improvements Project, which also includes a new carpool lane and the demolition of eight freeway ramps.

Don't say we didn’t warn you. Who knows, maybe we'll have another Carmageddon baby boom?

All photos courtesy of the project's Facebook:

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  • Wilshire ramps that will be closed on the 405 freeway.

  • This photo of the Wilshire Bl/I-405 ramps looks southwest. You'll notice the Los Angeles National Cemetery sits at the lower right. Beginning June 22, two of the ramps will be demolished, the beginning of 90 days of reconstruction. The photo was taken June 10. Photo by Gary Leonard for Metro.

  • Rendering of Completed Wilshire Loops

  • Widening the I-405 requires rebuilding three overpasses: Sunset Bl., Skirball Center Dr., and Mulholland Dr. The upgraded Sunset Bl. Bridge would feature: • Higher capacity on- and-off ramps • Seismic upgrades • Four-foot-wide road shoulders in each direction • Five-foot-wide sidewalks in each direction • Thirteen-foot-wide center median

  • Rendering of Completed Mulholland Dr Bridge

  • Aerial photo of Mulholland Bridge shows work on south side of bridge. Photo was taken looking northeast. Photo by Gary Leonard for Metro.

  • Looking southeast, this photo shows the work on the north side of Sunset Bridge, anticipated to be completed in September 2012. The girders placed during the week of April 30 are clearly visible, as is the false work for the new northbound on-ramp from eastbound Sunset. This photo was taken June 10. Photo by Gary Leonard for Metro.