Question

The ruling design speed on a National Highway in plain terrain as per IRC recommendations is ____

• A. \(60\ \mathrm{kmph}\)
• B. \(80\ \mathrm{kmph}\)
• C. \(100\ \mathrm{kmph}\)
• D. \(120\ \mathrm{kmph}\)

Hint:

IRC ruling design speeds: \[ \boxed{ \begin{aligned} \text{Plain terrain} &\rightarrow 100\ \mathrm{km/h}\\ \text{Rolling terrain} &\rightarrow 80\ \mathrm{km/h}\\ \text{Mountainous terrain} &\rightarrow 50\ \mathrm{km/h}\\ \text{Steep terrain} &\rightarrow 40\ \mathrm{km/h} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Recall the IRC design speed recommendations. According to IRC guidelines, the ruling design speed depends on the type of terrain.

Step 2: Identify the value for plain terrain. For a National Highway in plain terrain, \[ \boxed{100\ \mathrm{kmph}} \] is the recommended ruling design speed. Hence, \[ \boxed{(C)} \] is the correct answer.