Look up White Bird Hill, Idaho on Google Maps. Check out the elevation change from top to bottom. 4,245 ft (1,294 m) at the summit.
Headed south, it's a quite steep grade. Many was the time I would drive down that road, no need for brakes or down shifting (especially in my 1977 Mustang with 351ci V8, same for my 1988 Corsica after replacing the buggy computer chip) while tooling along at 55 MPH.
Almost always some nut would blast past me at the summit, driving hard into every curve, frying his brakes. At the bottom I'd still be right on his tail. All that extra effort for no gain in overall time down the mountain.
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