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4 cards from this section. Quick, good the night before a test.
What is the definition of chainage?
Think about how distance is measured in road construction.
What does the deflection angle represent?
Consider its role in determining the curve's geometry.
What does chainage measure?
Think about how engineers find positions on the road.
True or False: The deflection angle is the angle between two arcs in a compound curve.
Consider where the angles are measured at the curve.
A compound curve has two arcs with radii of 400 and 600 meters respectively. If the first arc has a deflection angle of 50 degrees, calculate the total length of the curves using the given radii and angles.
Use the formula for curve length for each arc and sum them.
If the tangent at the point of intersection is 100 m long and the chainage at the PI is 2000 m, determine the chainage at the start of the curve.
Subtract the tangent length carefully from the point of intersection.
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