Determine the minimum length of a crest vertical curve, using the minimum length based on SSD criteria if the grades are +4% and –2%. Design speed is 70 mi/h. State assumptions used.
What will be an ideal response?
Assumptions used include: perception-reaction time is 2.5 seconds, deceleration
rate is 11.2 ft/sec2, and the case is sight distance is less than the length of the
curve.
Determine required stopping sight distance using Equation 3.27:
Since S < L, use Equation 15.5 to calculate the minimum length of the curve.
Therefore, for the given design conditions, the minimum length of the curve is
1,727 ft.
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