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Engineering · Civil Engineering
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Part A. The following information is for a proposed horizontal curve in a new subdivision: PI Station: 12+40.00 R-572.96 feet Deflection angle A-12.30 What is the Station of PT? PI PC PT Part B. An existing highway has a historic site located at the PT of an existing curve with a PI located at Station 80+00, an extemal angle of 65°, and a radius of 1,200 ft. The curve must be relocated, moving the PI to Station 78+00. The external angle and the PC will remain the same. What is the radius of the new curve? Not to Scale PI-STA 80+00 200 ft Δ-65° Historical Site PT PC Part C. A horizontal curve on a 4-lane highway (two lanes each direction and no median) has a superelevation of 4% and a central angle of 40 degrees. The PT of the curve is at station 322 +50 and the PI is a 320+08. The road has 12-ft lanes and 6-ft shoulders on both sides with high retaining walls going up immediately next to the shoulders. What is the highest safe speed of this curve (highest in 5 mi/hr increments) and what is the station of the PC?

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