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2 cards from this section. Quick, good the night before a test.
Define chainage and give an example.
Think of how distances are marked on a road.
What is the formula for calculating tangent length?
Identify R and Δ in a simple example first.
What is the formula for calculating the tangent length in circular curves?
Pay attention to how the angle is used in calculations.
True or False: Chainage can only represent straight line distances.
Think back to how chainages are established on curves.
Given two straights with a meeting point at a chainage of 1500m and a deflection angle of 45°, calculate the required radius for a designed curve and report the tangent lengths as well.
Apply both formulas sequentially for clarity.
A circular curve needs to connect a point of intersection at 2000m. If the radius is set to 100m and the deflection is 90°, calculate both your tangent lengths and the overall chainage for endpoints.
Map your solutions stepwise and ensure units are consistent.
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