If all goes according to the Metropolitan Transportation Authority’s plan, Los Angeles will avoid the dreaded “Carmageddon” this weekend when a major highway section is sealed off. Related Links: Locals' Ire Doomed a Simpler I-405 Plan All of Southern California, it seems, is bracing for the shutdown of a 10-mile section of Interstate 405 so that one of its overpasses, the Mulholland Drive Bridge, can be partially demolished as part of a $1-billion project to upgrade the I-405 between Interstate 10 and U.S. 101.The media-saturated region dubbed the weekend closure “Carmageddon” in reference to the end of Southern California driving