2.2. Chainage of PI

Try these first

1. 1.

   What is the formula for calculating tangent length?

   Hint

   Think about the relationship between angle and tangent.

2. 2.

   Define the Point of Intersection.

   Hint

   Consider it in the context of a circular curve.

3. 3.

   What is the formula for Length of Curve?

   • L = R * Δ
   • L = πRΔ
   • L = R * (Δπ/180)

   Hint

   Think about how arcs are calculated.

4. 4.

   True or False: The PI is where two tangents intersect.

   • True
   • False

   Hint

   Consider where paths would meet.

5. 5.

   A curve has a radius of 500 m with a deflection angle of 30°. Calculate the Length of Curve and provide the Chainage if the PI is at 1000 m.

   Hint

   Use the formulas we've discussed to guide your calculations.

6. 6.

   If a radius of 300 m and a PI at 1200 m are given, but you also have a deflection angle of 45 degrees, what's the tangent length and the chainage at point T?

   Hint

   Don’t forget to apply the right formulas carefully!