2.47. A 4.56° circular curve is to be designed to fit between two intersecting straights. What is the radius of this curve? (Ans:1256.49 m)

Try these first

1. 1.

   What is the deflection angle provided in this section?

   Hint

   Refer to the section title for the angle measurement.

2. 2.

   What is meant by circular curve?

   Hint

   Think about how roads transition from straight to circular.

3. 3.

   What is the radius calculated for a circular curve with a 4.56° deflection angle?

   • 1256.49 m
   • 500 m
   • 1000 m

   Hint

   Refer back to the calculation presented.

4. 4.

   True or False: A circular curve connects two straight paths.

   • True
   • False

   Hint

   Consider how bends in roads are designed.

5. 5.

   Calculate the radius of a circular curve with a deflection angle of 10° and an arc length of 1000 m.

   Hint

   Make sure you calculate sin of half the angle first.

6. 6.

   Discuss the factors affecting the choice of radius in designing a highway curve.

   Hint

   Think about how these factors affect safety and road usability.