Traffic Engineering

  Important Question for GTU Exam

1.       What is PCU? Give factors affecting PCU. Describe various vehicular characteristics considered in traffic engineering.

2.       Explain term traffic volume. Also discuss different methods of carrying out traffic volume studies.

3.       One kilometer section of road is covered by three vehicles in 1 minute, 2 minute and 3 minutes. Calculate time mean speed and space mean speed.

4.       Explain various warning signs as per IRC with sketch. (b) Determine air resistance to a vehicle with 2.15m2 frontal area moving with 60 kmph speed. Take Ca = 0.39.

5.       Explain various methods of O and D study. (b) A car of mass 1365kg is travelling with the speed of 40kmph on a premix carpet road. Determine rolling resistance of the car. Take coefficient of resistance as 0.016.

6.       Define: Luminous flux, foot candle, Luminaire, Silhouette, Glare, Amber period, Saturation flow, Slip, Skid, Design speed

7.       Enlist various types of traffic signals?  Explain fixed time signals with its advantages and disadvantages.

8.       Enlist the various design factors in road lighting and explain various types of road marking as per IRC.

9.       What is traffic rotary? What are its advantages & limitations, in particular reference to traffic conditions in India?

10.     What are the functions of traffic engineering?

11.      Explain normal resistances encountered by a vehicle on uphill with sketch.

12.     Show the conflict points on cross roads with two way traffic on both roads & one way traffic on both roads.

13.    The driver of a vehicle travelling at 80km per hour requires 8.5m less to stop after applying the brakes up a grade, than when travelling down the same grade. If the coefficient of friction is 0.55, calculate: a) The percent of the gradient. b) The braking distance on the down grade.

14.Write a short notes on “3-E’s” for road safety.

15. Draw a sketch of a) collision diagram and b) condition diagram.

16. How to analyses & presentation of speed data by tabular arrangement & graphically.

17. Discuss briefly the various factors which affect the road user characteristics and their effects in traffic performance.

18.  Draw a neat sketch of Diamond interchange and show the movement of traffic.

19.Draw sketches on lighting layout for a) Horizontal curves of highway and b) Intersections.

20.  How different vehicular characteristics do affects road features?

21. A vehicle is accelerating on an upward gradient of 1.5 % with a rate of 0.8m/sec2 , from initial speed of 15 to 25 km/h. Calculate various resistances encountered by the vehicle using following data : 1. Mass of vehicle : 1500 kg. 2. Coefficient for rolling resistance: 0.02 3. Frontal area of vehicle: 3.5 m2 4. Coefficient for air resistance: 0.40 kg/m3.

22.Explain Webster’s method of signal design.

23. Prepare a check list of facilities to be provided at any terminal. Justify your answer for each of facility to be provided.

24.Draw a neat sketch of (i) Partial clover leaf intersection (ii) Full clover leaf intersection. (iii) Diamond interchange.

25. Calculate Time mean speed and Space mean speed from the following spot speed observations in km/hr. 50,40,60,54,45,31,72,58,43,52,46,56,43,65,33.

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