![]() Likewise, traffic leaving the 101/405 interchange was down 34 percent in the west/northbound direction and 31 percent east/southbound. On the Ventura Freeway just north of the closure, westbound traffic volumes were down by 43 percent, and eastbound by 45 percent. In virtually every location we examined, traffic levels were way down along potential Carmageddon detours. Traffic did not simply take detours around the closure. Southbound traffic on the 405 in the San Fernando Valley dropped even more: 73 percent. closure on Carmageddon Saturday, compared with a typical summer Saturday. ![]() So how did the roughly 300,000 travelers who traverse the affected stretch of the San Diego Freeway each day respond? There was a 61 percent decrease in traffic volume heading northbound on the 405 toward the West L.A. County Supervisor Zev Yaroslavsky coined the term "Carmageddon." Local, national, and international media picked up and repeated news of the impending closure, emphasizing the potentially dramatic consequences of motorists failing to avoid the area. ![]() With the second closure a few weeks away in late September, we should consider what was learned from the first.Ĭoncerned that motorists might fail to heed upbeat calls for behavior change, some elected officials delivered more ominous messages. The closure was widely publicized and public officials sounded messages of hope that Angelenos would pull together to minimize the negative effects. During the closure, contractors demolished the southern half of the Mulholland Drive Bridge in the Sepulveda Pass. In 2010, Los Angeles began planning for the weekend closure of a 10-mile stretch of the 405 Freeway linking the Westside to the San Fernando Valley in July 2011.
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