Regional Plan Association Forgets About Shoulders- Places stranded motorists and emergency crew workers at needless risks, wasting opportunities for reasonable widening within existing corridors- see illustration:
http://fourthplan.org/action/remove-highways
Decking is a perfectly valid concept, but must be combined with taking full advantage of the existing corridors. Alas the concept there is sullied by the reactionary nonsense of *removing* freeways, rather than redesigning them for improved service to the public.