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highway_geometric_design_others

# highway_geometric_design_others - CEE 3604 Transportation...

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Transportation Engineering (A.A. Trani) CEE 3604 Transportation Geometric Design Others 1

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Transportation Engineering (A.A. Trani) Horizontal Curves (Highways) 2
Transportation Engineering (A.A. Trani) Note Some Differences with Vertical Alignments The length L is deFned along the curved path In vertical curve L was deFned along the x axis The transition curve is a circle in horizontal alignments vs a parabola 3

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Transportation Engineering (A.A. Trani) Fundamental Equations 4 T R = tan Δ 2 T = R tan Δ 2 E = external distance M = middle ordinate T = tangent length
Transportation Engineering (A.A. Trani) Example # 1 5

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Transportation Engineering (A.A. Trani) Example # 1 Solution 6
Transportation Engineering (A.A. Trani) Turning Radius (Highway Design) 7 R = v 2 g ( e + f ) Source: NYSDOT http://downloads.transportation.org/SuperelevationDiscussion9-03.pdf

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Transportation Engineering (A.A. Trani) AASHTO Design Values 8
Transportation Engineering (A.A. Trani) AASHTO Design Tables 9

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Transportation Engineering (A.A. Trani) Example # 2 Calculate minimum radius for a design speed of 120 [km/h]. The superelevation rate is limited to 0.06 due to icing effects in winter 10 R = v 2 g ( e + f )
Transportation Engineering (A.A. Trani) Example # 2 Solution Using Table 7.8 we extract the necessary information 11

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Transportation Engineering (A.A. Trani) How to Achieve Superelevation? Superelevation requires a smooth transition from a Fat highway to a curved highway with the desired superelevation Several concepts have can be applied Linear superelevation rate concept is used 12
Transportation Engineering (A.A. Trani) Example # 3 13 A horizontal curve requires a 100 meter transition length to achieve the full superelevation of 0.08 (see Figure). A suggested superelevation schedule is shown in the Figure. Note that we start with the standard road with a crown and two

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highway_geometric_design_others - CEE 3604 Transportation...

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