Practice Quiz

Surveying FS

Category - Plane Survey Calc

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Of the following, which is the approximate optimal length for a transitional spiral curve when using a 2,500 ft circular curve and a design speed of 65 mph?
  1. 50 ft
  2. 100 ft
  3. 175 ft
  4. 200 ft
Explanation
Answer: C - The approximate optimal length for a transitional spiral curve when using a 2,500 ft circular curve and a design speed of 65 mph is 175 ft.

Solution

Use the transitional spiral curve formula:

L = 1.6 (design speed)3 / radius of the circular curve

Where design speed = 65 mph

radius of circular curve = 2,500 ft

L = 1.6 (65 mph)3 / 2500 ft = 176 ft (use 175 ft)
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