The thing is, anyone trying to get over the hill from the Valley headed south, or trying to get TO the valley headed north who would normally use the 405 has very few options. I shudder to think what Sepulveda will be like. Topanga? Laurel? Coldwater? Those are sure to be nightmares. So that leaves the 101/5 as the main alternate. It's not going to be the destination for ALL traffic that would have been destined for the 405, but it will most definitely see an increase in traffic, which will have ripple effects beyond the short stretch that will technically be the detour.
Of course, some of that will be alleviated by the number of people who will no doubt be too paranoid about the traffic to even get on the road. But considering how one fender bender somewhere on the 101 usually manages to slow down every other freeway for miles around, it's not beyond imagining that closure of one of the heaviest traveled major arteries could lock things down all around the city.
Getting away fom Hollywood to head to Disneyland probably won't be a problem. But headed back towards the 5/101 split? That I'd be worried about.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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