A new overpass is being designed and will be crossing an existing roadway 200 feet prior...

A new overpass is being designed and will be crossing an existing roadway 200 feet prior to it’s PVI (station 120+00). The existing roadway has grades of -4% and +5% and a sag vertical curve length of 1000 feet. The PVC elevation is at 600 feet. There are a significant number of trucks that use the existing roadway. Determine the minimum elevation that then new overpass can be at as measured from the bottom of the overpass based on sight distance for trucks. (FYI, also think about the height of trucks as well.)

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Ally Wells answered 6 months ago

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