The design speed of a highway is 80 kmph and the radius of the circular curve is 150 m in plain topography. Which one of the following is the minimum length of the transition curve?

The design speed of a highway is 80 kmph and the radius of the circular curve is 150 m in plain topography. Which one of the following is the minimum length of the transition curve?

• A. 174 m
• B. 85 m
• C. 140 m
• D. 120 m

 

The correct answer is option C. 140 m. Can you explain this answer in the comments?

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