On a section of a four-lane undivided urban highway just inside the Little Rock, Arkansas city...

  

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On a section of a four-lane undivided urban highway just inside the Little Rock, Arkansas city limit, the roadway curves to the left to avoid a nearby cemetery. The degree of curvature is 2° 00'. The PI is located at STA 240+ 63.28. The deflection angle at the PI is 80° 30' 00". The vertical alignment consists of a 1,000-foot vertical curve joining a - 1% grade and a + 2% grade. The PVI is at STA 252 +00 and has an elevation of 320.50 feet. ASHTD requires a superelevation rate of 7% and desirable transition length of 350 feet. Use these values for your computations. Assume a normal crown section with 2% cross slopes and 12-foot lane widths. Assume the superelevation revolves around the center line of the roadway. Use ASHTD procedures to distribute the superelevation transition length before and after the PC station. Compute the superelevation for the roadway and edge of pavement elevations at the stations listed below. Compute superelevation rates to at least five decimal places if you are working in terms of stations. Compute superelevation rates to at least seven decimal places if you are working in terms of feet per foot. The elevations should be computed to feet to two decimal places. Superelevation Edge of Pavement Elevation STATION 249+00 (Left) 249+00 (Right) 251 +00 (Left) 251+00 (Right) On a section of a four-lane undivided urban highway just inside the Little Rock, Arkansas city limit, the roadway curves to the left to avoid a nearby cemetery. The degree of curvature is 2° 00'. The PI is located at STA 240+ 63.28. The deflection angle at the PI is 80° 30' 00". The vertical alignment consists of a 1,000-foot vertical curve joining a - 1% grade and a + 2% grade. The PVI is at STA 252 +00 and has an elevation of 320.50 feet. ASHTD requires a superelevation rate of 7% and desirable transition length of 350 feet. Use these values for your computations. Assume a normal crown section with 2% cross slopes and 12-foot lane widths. Assume the superelevation revolves around the center line of the roadway. Use ASHTD procedures to distribute the superelevation transition length before and after the PC station. Compute the superelevation for the roadway and edge of pavement elevations at the stations listed below. Compute superelevation rates to at least five decimal places if you are working in terms of stations. Compute superelevation rates to at least seven decimal places if you are working in terms of feet per foot. The elevations should be computed to feet to two decimal places. Superelevation Edge of Pavement Elevation STATION 249+00 (Left) 249+00 (Right) 251 +00 (Left) 251+00 (Right)