On Thu, Jan 28, 2010 at 6:35 PM, Anthony <[email protected]> wrote: > On Thu, Jan 28, 2010 at 6:14 PM, Dale Puch <[email protected]> wrote: > >> So a bridge over a river or dug ditch is layer 1, and the water would be 0 >> > > What about a dug ditch without a bridge over it? Is that layer=0? It's > certainly "open to the air surface", isn't it? So when the ditch is dug, > the layer is 0, but then when I stick a plank on top of it it suddenly > becomes layer=-1? >
Oops, I totally misread that one. So 95 south at http://www.aaroads.com/northeast/pennsylvania075/i-095_sb_exit_020_04.jpgwould be tunnel=yes, layer=0? Or would it be left untagged altogether? Or something else?
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