it is one of the world s busiest highways. although it s not usually moving. no, that was an unusual sight with the cars moving. a big construction project there could interfere with a couple s wedding this weekend. the bridegroom and others who rely on the 405 are scrambling. here s abc s abbie boudreau. reporter: only in l.a. would a road closure have people talking about the end of the world. carmageddon. the 405 will be closed between the 10 and the 101. reporter: they re calling it carmageddon, an asphalt apocalypse. stay the hell away from the 405. reporter: this is the most congested highway for drivers in the country. on a typical weekend, 500,000 cars pack this road. but this weekend, for 53 straight hours, a 10-mile stretch of it will be closed. it s one of the most special moments in our lives. reporter: dalia franco and moshe schmul didn t know about carmageddon when they began planning their wedding a year