If N is the algebraic difference of grades, S is the headlight sight distance in meters, then the transmission length of a valley curve should roughly be equal to

If N is the algebraic difference of grades, S is the headlight sight distance in meters, then the transmission length of a valley curve should roughly be equal to

• A. NS^2/6
• B. NS^2/9.6
• C. NS^2/4
• D. NS^2/10

 

The correct answer is option C. NS^2/4. Can you explain this answer in the comments?

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