ICDP3-361-12

ICDP3-361-12 - that starts at the PC and ends at the PT of...

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In-Class Design Problem #3 : Geometric Design (2) For this exercise, you are to design a single-lane interchange ramp (so R = Rv) to connect two highways that intersect at a right angle as shown below, The north-south highway is the existing highway and is at a constant grade at elevation 565.5 R. The east-west highway new construction and is to be designed at a constant grade above the north-south highway with a bridge structure depth of 6R to the roadway surface (you can determine the elevation of the east-west roadway using desirable AASHTO recommendations). The ramp is to consist of a horizontal curve starting on the east-west highway with a PC starting at station 40+00. A 4 percent superelevation is to be used with a 40mi/h design speed. Determine: the length of the ramp minimum M, for horizontal curve sight distance a vertical alignment to connect the two highways (crest, constant grade section, sag)

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Unformatted text preview: that starts at the PC and ends at the PT of the horizontal curve. give stations and elevations of PVC's, PVT's, PC's and PT's The previous ramp is for eastbound traffic going south. Using the same roads (elevations etc.), design a clover-leaf ramp for eastbound traffic going north. The ramp is to consist of a horizontal curve starting on the east-west highway with a PC starting at station 49+60. For this ramp, a 12 percent superelevation is to be used with a 40mi/h design speed. Determine: • the length of the ramp • minimum M s for horizontal curve sight distance • length ofvertical curves • give stations only (no elevations) of PVC's, PVT's, PC's and PT's 4'\+(,.0 6J\\$f _\AJ:. .:. .S_S~T-1-........ 1>;;:;:c::.:-------------_G-::: 0'7. i> T "'------ro ~ '" o I ~ o 2...
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ICDP3-361-12 - that starts at the PC and ends at the PT of...

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