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  Module 3: Geometric design of highways
Lecture 15 Horizontal alignment II
  

2.Given R=100m, V=50 kmph, f=0.15. Find:

  1. $e$ if full lateral friction is assumed to develop [Ans: 0.047]
  2. find $f$ needed if no super elevation is provide [Ans: 0.197]
  3. Find equilibrium super-elevation if pressure on inner and outer outer wheel should be equal (Hint: f=0) [Ans: 0.197]
3.Two lane road, V=80 kmph, R=480 m, Width of the pavement at the horizontal curve=7.5 m. (i) Design super elevation for mixed traffic. (ii) By how much the outer edge of the pavement is to be raised with respect to the centerline, if the pavement is rotated with respect to centerline. [Ans:(i) 0.059 (ii) 0.22m] 4.Design rate of super elevation for a horizontal highway curve of radius 500 m and speed 100 kmph. [Ans: e=0.07, f=0.087 and with in limits] Given V=80 kmph, R=200m Design for super elevation. (Hint: f=0.15) [Ans: Allowable speed is 74.75 kmph and e=0.07]