An ascending grade of 5% and descending grade of 4% are connected by a parabolic curve. A motorist passing on the curve and whose eyesight is 1.5 m above the pavement could just see the top of a visible object 130mm high at a horizontal distance of 160 m. Determine the length of the parabolic curve connecting the gradelines.   a. 457.83   b. 425.48   c. 458.38 m   d. 424.98

2. A vertical parbolic curve was design in order to have a clear sight distance of 120 m. The grade lines intersect at Sta 9+000 at elev 160.50 . The curve was design such that when the height of the drivers eye is 1.50 m above the payment it would just see an object whose height is 0.10m above the pavement. Determine the max speed that a car could travel grade of 5% and a downgrade of -3%.

A simple horizontal curve has 35 degrees of curvature and subtends an angle of 110 degrees. If the PC is at station 3 + 65.00 ft, what is the length (ft) of roadway to the first full station on the curve?  The first full station occurs at 4+00

Just do question 2