15.3. Radius of Horizontal Curve

Try these first

1. 1.

   What is the ruling minimum radius formula?

   Hint

   Remember the variables involved in the formula.

2. 2.

   Why is a larger curve radius often safer?

   Hint

   Think about the forces acting on a vehicle in a curve.

3. 3.

   What is the formula for calculating the ruling minimum radius?

   • R = (v^2) / (g(e + f))
   • R = (g(e + f)) / (v^2)
   • R = v^2 * g * (e + f)

   Hint

   Keep in mind how each variable affects the outcome.

4. 4.

   True or False: A larger radius can lead to higher maximum comfortable speeds.

   • True
   • False

   Hint

   Consider the relationship between radius and speed.

5. 5.

   Given a road curve design for a maximum speed of 100 km/h, calculate the ruling minimum radius considering a superelevation of 0.07 and a friction coefficient of 0.15.

   Hint

   Use the ruling minimum radius formula and convert km/h to m/s.

6. 6.

   A curve has a radius of 300m, and the design speed is set to 90 km/h. What is the maximum allowable speed for a vehicle given that the coefficient of friction is 0.1 and the maximum superelevation is 0.07?

   Hint

   Remember to check if the calculated radius aligns with the design speed in practical scenarios.