CE 351  Introduction to Transportation Engineering Problem Set 2 DUE: Friday January 31, 2013, 10 am. For full credit you must draw the pictures....
An equaltangent crest vertical curve connects a +3.2% and a 1.1% grade. The PVI is at
station 98+20. Due to drainage considerations, the highest point of the curve is at station
100+79.35. Determine the station of the PVC and PVT, and the design speed of the curve.
The correct answers are... what is the procedure to solving this problem
92+89.05, 103+51.05, 70 mph
1 CE 351 – Introduction to Transportation Engineering Problem Set 2 DUE: Friday January 31, 2013, 10 am. For full credit you must draw the pictures. 1.Engineer Ali is designing a crest vertical curve for a highway heading to Mt. Hood, where the speed limit is 65 mi/h. The curve is 1100 ft long and has its PVC at station 125+00. The PVC elevation is 1000 ft. The initial grade leading to the curve is +2.5% and the final grade is 2.0%. (a) Determine the elevation and stationing of the high point, PVI, and PVT. (b) Does this curve satisfy stopping sight distance requirements? a) PVI 130+55 1013.75, PVT 136+00 1002.75, xhi131+11, 1007.64 b) Yes 2.Mt. Hood Meadows wants to add a welcome sign to the new highway to let drivers know they are near the entrance to the resort. The sign will be placed over an equal tangent sag curve, directly over the PVI. The sag curve has an initial grade of 2.2% and a final grade of +5.0%. The PVC is at station 14+10 and the PVT is at station 23+90. (a) What is the minimum height Engineer Ali can place the welcome sign above the street for SSD requirements? (b) Does the minimum height satisfy AASHTO minimum clearance height recommendations? a) 7.98 ft b) No 3.12 An equaltangent crest vertical curve connects a +3.2% and a 1.1% grade. The PVI is at station 98+20. Due to drainage considerations, the highest point of the curve is at station 100+79.35. Determine the station of the PVC and PVT, and the design speed of the curve. 92+89.05, 103+51.05, 70 mph 3.13 A 1200ft equal tangent crest vertical curve is currently designed for 50 mph. A civil engineering student contends that 60 mph is safe in a van because of the higher driver's eye height. If all other design inputs are standard, what must the driver's eye height (in the van) be for the student's claim to be valid? 8.9 ft
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