We've all seen in recent weeks the cruelty of hurricanes uprooting houses as easily as trees, tossing cars into fields and reducing farms to rubbish heaps. Tropical storms go where they want, and anything less than monolithic masonry is a goner. Even with the damage they bring, however, hurricanes are kinder than freeways.
Only two exceptions are available to alter the impact of freeways: In the case of elevated roadways, we can take them down, as San Francisco did with the Embarcadero Freeway along the waterfront. And in the case of corridors located in trenches, we can build above them.