Bridge Bash

Motorists pass by an upside-down traffic sign as the 405 Freeway in Orange County reopens.  (Patrick T. Fallon / For the Times)

Construction dust swirls as the 405 Freeway in Orange County reopens.  (Patrick T. Fallon / For the Times)

Traffic gets up to speed as the 405 Freeway in Orange County reopens.  (Patrick T. Fallon / For the Times)

Construction continues near the reopened 405 Freeway in Orange County.  (Patrick T. Fallon / For the Times)

Demolition crews clean up and remove the old Highway 22 connector bridge on the 405 Freeway in Orange County.  (Patrick T. Fallon / For The Times)

Construction crews continue to remove the former Highway 22 connector over the 405 Freeway.  (Patrick T. Fallon / For The Times)

A tangle of wire remains after the Highway 22 connector was removed from spanning the 405 Freeway.  (Patrick T. Fallon / For The Times)

Demolition crews remove the old Highway 22 connector bridge on the 405 Freeway in Orange County, dubbed the “Bridge Bash” by transportation officials. The 405 Freeway is scheduled to reopen this afternoon.  (Patrick T. Fallon / For The Times)

Truck drivers wait for demolition crews to remove the old Highway 22 connector bridge on the 405 Freeway in Orange County.  (Patrick T. Fallon / For The Times)

Construction crews prepare the area surrounding the old south 405 Freeway connector to the 22 east, right, for demolition, as seen from the new connector on Saturday evening.   (Jay L. Clendenin / Los Angeles Times)

A day before the planned shutdown, commuters are bumper to bumper southbound on the 405 Freeway heading toward the 22 Freeway.   (Cheryl A. Guerrero / Los Angeles Times)

The new and old 22 eastbound connector bridge. The old span will be demolished over the weekend, closing the 405 freeway.  (Cheryl A. Guerrero / Los Angeles Times)

A new interchange will connect lanes of the 405 and 22 freeways.  (Cheryl A. Guerrero / Los Angeles Times)

A construction worker prepares for a planned 20-hour closure of the 405 Freeway in Orange County.  (Cheryl A. Guerrero / Los Angeles Times)

Drivers pass underneath the Valley View Avenue exit and the eastbound 22 Freeway.  (Cheryl A. Guerrero / Los Angeles Times)

A construction worker moves some dirt ahead of the planned 20-hour closure of the 405 Freeway.  (Cheryl A. Guerrero / Los Angeles Times)

A construction worker prepares for the 20-hour closure.  (Cheryl A. Guerrero / Los Angeles Times)