Question

1) Determine the minimum radius of curvature required for a 60 mi/hr design speed with a 0.06 superelevation rate and 64 degree of curvature (A). Find the locations for T.C. and C.T. if the P.I. is located at 500+00. In addition, calculate T, L, M, E, and C. 2) Prepare a table of chords and deflection angles for staking out a 600 foot radius circular curve with a deflection angle of 60 degrees. Give values for every full station and the C.T. The T.C. is located at 22+00. 3) As a highway engineer, you have been asked to design a horizontal curve to connect two tangent sections with a 10 degree of curvature (A), 60 mi/hr design speed and a superelevation of up to 6%. To complicate matters, there is an environmentally sensitive area located at the PI such that the roadway must maintain a minimum clearance distance of 150 feet (see figure). If possible, determine the appropriate R and calculate L, T, M, E, and C for this curve. 10 degrees 150 Feet CT TC

Answer 1

Given, Vo Gomila e. 0.06 6% Sta PI, (500 too) A 64 Taking faois we know, 0.01 et pour le Roma Corete) 15/001006 +0.15) Ro 142186 ft "To Rtan A, 1142.86 tan 62 2 714.14 ft L. TRATX 142.86 x 64 180 - 12 F6 59 ft. E R [sec Ab --] 1142.54 [sec (4%) -] ***206+ 204.48 fun ico Q R Sin / 2 2x1142.86 x 8in (64) it's 1211.25 ft i sta TC a sta PI -T z sta(500+oo - 714.14 sta(492+85.86). "Sta CT2 start STATC the 2 stal 492785.86] + 1276.50 asta (505+62-45)