G1=+1%, G2=+4%; A ditch is running in positive stationing of +2.5% starting at the PC

1. G1=+1%, G2=+4%; A ditch is running in positive stationing of +2.5% starting at the PC. In terms of what % of curve length (PC to critical point) does the critical point for vertical curve design exist to keep the curve a prescribed distance above the ditch?
2. PC elev = 200.00 G1 = -3% G2 = +2 % low elevation on curve is 184.00 Find L.
3. PI elev = 85.00 G1=-1% G2=+2% low elevation on curve is 1000 Find L.
4. A non-equal tangent curve has L1=20 stations G1=-1% and L2=30 stations G2=+2%. What is the grade from the intermediate PI on the incoming tangent to the intermediate PI on the outgoing tangent?

Solution:

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