1.3. Radius R

Try these first

1. 1.

   What is the formula for tangent length?

   Hint

   Think about the relationship between the radius and the deflection angle.

2. 2.

   Define deflection angle.

   Hint

   Consider how tangents are positioned relative to curves.

3. 3.

   What is the tangent length formula?

   • R tan(Δ)
   • R tan(Δ/2)
   • R sin(Δ)

   Hint

   Consider how tangents relate to angles and curvature.

4. 4.

   True or False: A smaller radius leads to safer curves.

   • True
   • False

   Hint

   Reflect on road safety principles.

5. 5.

   Calculate the radius needed for a road curve where the maximum tangent length is 150 m and Δ is 60°.

   Hint

   Rearrange the formulas to isolate R.

6. 6.

   Determine the total chainage if you have five points (20 m apart) from a starting point at 2500 m along a curve.

   Hint

   Focus on properly calculating distance from starting point.