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What is the angle of a 15% road grade?

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What is the angle of a 15% road grade?

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  1. That is the road slope


  2. 15% means it goes up 15 for every horizontal 100.

    which means tan θ = 0.15

    θ = 8.5 deg

  3. if you are going uphill it's +8.53 degrees

    if you are going downhill it's -8.53 degrees
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