[amp_mcq option1=”8 kmph” option2=”12kmph” option3=”16kmph” option4=”20 kmph” correct=”option4″]
The correct answer is: D. 20 kmph
The minimum value of ruling radius of horizontal curves in plains is calculated using the following formula:
$R = \frac{v^2}{127}$
where:
- $R$ is the ruling radius in meters
- $v$ is the design speed in kilometers per hour
Therefore, for a design speed of 20 kmph, the minimum value of ruling radius is:
$R = \frac{20^2}{127} = 34.64$ meters
The other options are incorrect because they are not the minimum value of ruling radius for a design speed of 20 kmph.