USN 10cv755

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Seventh Semester B.E. Degree Examination, Dec. 2Ul3/Jan.2OL4Highway Geometric Design

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Time: 3 hrs. Max. Marks:100Note: 7. Answer FIVEfull questions, selecting

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. PART_A .

I a. Briefly discuss the various design factors to be considered for geometric design "tiifrt[?l;b. Enumerate the concept of PCU in geometric design of highways. List out the factors

a. Distinguish between skid and slip with practical examples. Enumerate the factors affectingliiction of skid resistance. (10 Marks)

b. What is camber? List the functions of camher. Discuss the factors governing camber.Explain different shapes of camber with the help of neat sketches. (10 Marks)

a. What is stopping sight distance (SSD)? List out the factors affecting SSD. Derive the

governing PCU. Give some typical values as recommendod by IRC.

expression for finding SSD on a road rzrith a down gradient of - no/o.

safe overtaking sight distance (OSD) sketch the overtaking zone.

advantages and limitation of a rotary intersection.b. Explain the concept of grade separated intersections, with sketches.

b. The speeds of overtaking & ovleltaken vehicleg are 96 kmph and 80 kmph respectively, on atwo way traffic road. If the acceleration of oVertaking vehicle is 2.5 kmph/sec calculate the

a. What is super-elevation? With the aid olsketches. explain how super-elevation is introducedon a horizontal curve in the field. (10 Marks)

b. Calculate the lelgth of transition curve of the shift using the following data :

Design speediSOkmph; Radius of horizontal curve:500m; normal pavement width:7m.Allowable rate of introduction of super-elevation : 1 in 150 lPavement rotated about inneredge).

PART _ B

5 a Explain the following with IRC recommended values for plain and rolling ti) Ruling gradientii) Limiting gradientiii) Exceptional gradientiv) Minimum gradient.

b. A valley curve is formed by a descending gradient of 1 in 25 meeting an ascending gradientof 1 in 30. Design the length of valley curve to fulfiII both comfort condition and head lightdistance requirement for a design speed of 80 kmph. Assume allowable rate of change ofcentrifugal acceleration : 0.6 m/sec3, (10 Marks)

6 a. What is a rotary intersection? Under what circumstances atraffrc rotary is justified? Mention

(10 Marks)

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10cv755

7 a. With the help of neat sketches, indicate various intersections at grade. State the advantagesof grade separated intersections. (10 Marks)

,, rr b. What is an overpass and underpass? Mention the advantages and disadvantages of overpass' ;,,." ,. *d underpass.

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I .,u. State the requirements of an efficient drainage system. With the help of neat sketches,

i..; explain how surface drainage is effected in rural highways and urban roads. (10 Marks)b:{'Il}e maximum quantity of water expected in one of the open longitudinal drains on clayey

ryS: 0.9 m3/sec. Design the crois section and longitudinal slope of trapezoidal drainasstlffig the bottom width of trapezoidal section to be 1.0 m and eross slope to be 1.0vertiCal''to" 1.5 horizontal. The allowable velocity of flow in the drain is 1.2 m/sec andMannin$?{,r,,0.!shness coefficient is 0.02. ,-'. .,n (10 Marks)

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