Frequently Asked Questions
Is percent grade the same as degrees?
No. They are different scales. A forty five degree slope is a one hundred percent grade, not fifty percent, because at that angle the rise equals the run.
What grade is considered steep for a road?
Highways are usually kept below six percent for comfort and safety, while mountain roads may reach eight percent or more, which affects braking and fuel use.
Do the rise and run need the same units?
Yes. Use the same length units for both because the grade is a ratio, so consistent units cancel and the result is independent of the unit chosen.
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