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Originally Posted by Brian Carlton
I wouldn't want to see a 6 degree grade.........that's a 10% grade. Most steep hills on a limited access highway are in the 6-7% range..........about 4 degrees.
A couple of the hills in San Francisco are 32% grades........about 18 degrees.......and they seem like a mountain. You definitely need first gear for them.
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You're right, that's very steep. There are some mountain roads around here that may be that steep, but not many. The steepest highway grades here are also about 7% (Vail Pass on I-70 is 10,666ft with a 7% grade) and that's still pretty steep.