On Aug 2, 2012 2:19 PM, "John F. Eldredge" <j...@jfeldredge.com> wrote: > > > What is an "emergency Interstate"? I don't think I have ever heard that phrase before. Is it a detour to be used while the Interstate highway is under repair?
For when the mainline is closed due to emergency, in locations where this is prone to happen regularly or when an interstate would need excess capacity to handle evacuation volume. Typically forms a loop between two junctions on adjacent parallel routes that becomes a one way loop in case of emergency closure or add extra lanes when all available routes go away from a disaster. One such example exists along Oregon's I5 corridor. Intersections that are traversed by the emergency route are closed to cross traffic in most cases, and locations where the route turns at a junction typically have a ramp to straighten out what would otherwise be a tight turn, usually gated such that the ramp is inaccessible under normal circumstances but becomes the only way through when it's operating as the interstate.
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