For comparison, and I'm sure you drove it, the natural grade of Lombard St is 27% but the effective grade is 14% to 16%.jasonh300 wrote:fvwazing wrote:14% means the road drops 14m if you drive 100m. That is pretty steep.
What is that in feet? j/k
Yes, that's pretty steep. I did some research and the steepest grade on the U.S. Interstate system is 8%, and I have driven it (I-24/US-41/64 Westbound over Monteagle Mountain, TN).
fvwazing wrote:14% means the road drops 14m if you drive 100m. That is pretty steep.
fvwazing wrote:1m down for 1m of road? 90 degrees, of course.
Oops, my bad. Definition uses horizontal movement, not length of road.
AlanOfTheBerg wrote:jasonh300 wrote:So would 100% be 45 deg. or 90 deg.?
I imagine it would be 45deg where rise=run. Or run=fall.
harling wrote:14% grade: arctan(0.14) = 8 deg.
27% grade: arctan(0.27) = 15 deg.
33% grade: arctan(0.33) = 18 deg.
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