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jamesqf · 03-03-2009, 12:10 PM

Seems to me there's already a standard gradient limit on US highways. At least, it's fairly rare to see even a 7% grade on a main highway. The few places I know of that are steeper have major topographic constraints.

03-03-2009, 12:10 PM	#9 (permalink)
jamesqf Master EcoModder Join Date: Jun 2008 Location: Earth Posts: 5,209 Thanks: 225 Thanked 811 Times in 594 Posts	Seems to me there's already a standard gradient limit on US highways. At least, it's fairly rare to see even a 7% grade on a main highway. The few places I know of that are steeper have major topographic constraints.