Consider below highway curve which has a diameter of 280 m. Determine the maximum design speed limit of a highway curve if it restricts the highway design speed to only 75%. Use super elevation (e = 0.08), Assume the value of coefficient of friction based on the table below. Determine also the highway design speed.

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Chapter2: Loads On Structures
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1. Consider below highway curve which has a diameter of 280 m. Determine the maximum
design speed limit of a highway curve if it restricts the highway design speed to only 75%. Use
super elevation (e = 0.08), Assume the value of coefficient of friction based on the table
below. Determine also the highway design speed.
Table 3.3 Coefficient of Side Friction for Different Design Speeds
Design Speed (mi/h)
Coeficients of Side Friction, f,
30
0.20
40
0.16
50
0.14
60
0.12
70
0.10
SOURCE: Adapted from A Policy on Geometric Destgn of Highways and Streets, American Association of State
Highway and Transportation Officias, Washington, D.C. 2004. Used by permission.
2. If you are going to redesign the curve as to problem 1, so that its posted speed limit will be
the same as the design speed of the highway, what is the new minimum radius of the new
curve?
Transcribed Image Text:1. Consider below highway curve which has a diameter of 280 m. Determine the maximum design speed limit of a highway curve if it restricts the highway design speed to only 75%. Use super elevation (e = 0.08), Assume the value of coefficient of friction based on the table below. Determine also the highway design speed. Table 3.3 Coefficient of Side Friction for Different Design Speeds Design Speed (mi/h) Coeficients of Side Friction, f, 30 0.20 40 0.16 50 0.14 60 0.12 70 0.10 SOURCE: Adapted from A Policy on Geometric Destgn of Highways and Streets, American Association of State Highway and Transportation Officias, Washington, D.C. 2004. Used by permission. 2. If you are going to redesign the curve as to problem 1, so that its posted speed limit will be the same as the design speed of the highway, what is the new minimum radius of the new curve?
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