Highway Engineering - Essay Example

Nagger road plan formula were prepared by assuming a) rectangular or block road pattern b) radial or star and block road pattern c) radial or star and circular road pattern d) radial or star and grid road pattern 2. Select the correct statement. A) Nagger road plan formula take into account the towns with very large population. B) Nagger road plan has a target road length of 32 km per 100 square km. C) Second 20-year plan has provided 1600 km of expressways out of the proposed National highway. D) Second 20-year plan allowed deduction of length of railway track in the area while calculating the length of roads. . The sequence of four stages of survey In a highway alignment is a) reconnaissance, map study, preliminary survey and detailed survey b) map study, preliminary survey, reconnaissance and detailed survey c) map study, reconnaissance, preliminary survey and detailed survey d) preliminary survey, map study, reconnaissance and detailed survey NAS: c 4. The shape of the camber, best suited for cement concrete pavements, is a) straight line b) parabolic c) elliptical d) combination of straight and parabolic 5.

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For water bound macadam roads In locates of heavy rainfall, the recommended value of camber Is a) 1 In 30 b) 36 ) 1 in 48 d) 1 mini 6. The stopping sight distance depends upon a) total reaction time of driver b) speed of vehicle c) efficiency of brakes d) all of the above 7. When the path traveled along the road surface Is more than the circumferential movement of the wheels due to rotation, then It results In a) slipping b) sliding c) turning 8. Coefficient of friction is less when the pavement surface is a) b) dry c) smooth and dry d) smooth and wet 9.

The shoulder provided along the road edge should be rough a) b) c) d) 10. 11. Rougher than the traffic lanes smoother than the traffic lanes of same color as that of the pavement f very low load bearing capacity Camber in the road is provided for effective drainage counteracting the centrifugal force having proper sight distance none of the above Compared to a level surface, on a descending gradient the stopping sight distance is a) less b) more c) same d) dependent on the speed 12.

On a single lane road with two way traffic, the minimum stopping sight distance is equal to a) stopping distance 13. 14. Two times the stopping distance half the stopping distance three times the stopping distance The desirable length of overtaking zone as per IIRC recommendation is equal to overtaking sight distance two times the overtaking sight distance three times the overtaking sight distance five times the overtaking sight distance Stopping sight distance is always less than overtaking sight distance equal to overtaking sight distance more than overtaking sight distance 16. Increases with increase in speed decreases with increase in speed is same for all speeds If the stopping distance is 60 meters, then the minimum stopping sight distance for two lane, two way traffic is a) mm b) mm c) mm d) mm 17. The effect of grade on safe overtaking sight distance is a) to increase it on ascending grades and to decrease it on ascending grades b) to decrease it on descending grades and to increase it on ascending grades c) to increase it on both descending and ascending grades d) to decrease it on both descending and ascending grades 18.

The ruling design speed on a National Highway in plain terrain as per IIRC recommendations is a) 60 Kemp b) 80 Kemp c) 100 Kemp d) 120 Kemp 19. The terrain may be classified as rolling terrain if the cross slope of land is a) Upton 10% b) between and 25% c) between 25% and 60% d) more than 60% 20.

If b is the wheel track of a vehicle and h is the height of centre of gravity above dad surface, then to avoid overturning and lateral skidding on a horizontal curve, the centrifugal ratio should always be a) less than b/oh and greater than co-efficient of lateral friction b) less than b/oh and also less than co-efficient of lateral friction c) greater than b/oh and less than co-efficient of lateral friction d) greater than b/oh and also greater than coefficient of lateral friction 21.

As per IIRC recommendations, the maximum limit of super elevation for mixed traffic in plain terrain is a) 1 in 15 b) 1 in 12. 5 1 in 10 d) equal to camber 22. For the design of super elevation for mixed traffic conditions, the speed is educed by a) 15% C) 25% 23. On a horizontal curve if the pavement is kept horizontal across the alignment, then the pressure on the outer wheels will be a) more than the pressure on inner wheels b) less than the pressure on inner wheels c) equal to the pressure on inner wheels d) zero 25.

For a constant value of coefficient of lateral friction, the value of required super- elevation increases with a) increase in both speed and radius of curve b) decrease in both speed and radius of curve c) increase in speed and with decrease in radius of curve d) decrease in speed and with increase in radius of curve 26. To calculate the minimum value of ruling radius of horizontal curves in plains, the design speed is given by a) 8 Kemp b) Kemp c) Kemp d) 20 Kemp 27.

The absolute minimum radius of curve for safe operation for a speed of 110 Kemp is a) mm b) 220 m c) 440 m d) 577 m 28. The attainment of super elevation by rotation of pavement about the inner edge of the pavement a) is preferable in steep terrain b) results in balancing the earthwork c) avoids the drainage problem in flat terrain d) does not change the vertical alignment of road 29. Select the correct statement. A) Psychological extra widening depends on the number of traffic lanes. ) Mechanical extra widening depends on the speed of vehicle. ) Psychological extra widening depends on the length of wheel base. D) Psychological extra widening depends on the speed of vehicle. 30. In case of hill roads, the extra widening is generally provided a) equally on inner and outer sides of the curve b) fully on the inner side of the curve d) one-fourth on inner side and three-fourth on outer side of the curve 31. The transition curve used in the horizontal alignment of highways as per IIRC recommendations is a) spiral b) illuminates c) cubic parabola d) any of the above 32.

For design, that length of transition curve should be taken which is a) based on allowable rate of change of centrifugal acceleration b) based on rate of change of super elevation c) higher of (a) and (b) d) smaller of (a) and (b) 33. The maximum design gradient for vertical profile of a road is a) gradient b) limiting gradient c) exceptional gradient d) minimum gradient ruling 34. The percentage compensation in gradient for ruling gradient of 4% and horizontal curve of radius 760 m is a) 0. % d) no compensation 35. If ruling gradient is I in 20 and there is also a horizontal curve of radius 76 m, then the compensated grade should be a) 3 % 6. 37. 4% 5% 6% The camber of road should be approximately equal to longitudinal gradient two times the longitudinal gradient three times the longitudinal gradient half the longitudinal gradient Which of the following shapes is preferred in a valley curve ? A) simple parabola b) cubic parabola c) spiral d) illuminates 39. M 15 1 in 20 1 in 30 In case of summit curves, the deviation angle will be maximum when a) an ascending gradient meets with another ascending gradient b) an ascending gradient meets with a descending gradient c) a descending gradient meets with another descending gradient d) an ascending gradient meets with a level surface 0. If the design speed is V Kemp and deviation angle is N radians, then the total length off valley curve in meters is given by the expression a) 0. 38 N VI/2 b) 0. 38 c) 3. 8 NV d) 3. 8 If an ascending gradient of 1 in 50 meets a descending gradient of 1 in 50, the 41. Engel of summit curve for a stopping sight distance of 80 m will be a) zero 42. 43. 44. 45. Mm mm mm Highway facilities are designed for annual average hourly volume annual average daily traffic thirtieth highest hourly volume peak hourly volume of the year Nosecones is used to find average speed spot speed space-mean speed time-mean speed For highway geometric design purposes the speed used is a) 50 “”percentile 85th percentile 98 “”percentile Select the correct statement. Traffic volume should always be more than traffic capacity. B) 1 5th percentile Traffic capacity should always be more than traffic volume. ) Spot speed is the average speed off speed. 46. 47. 48. 49. Length of a vehicle affects width of traffic lanes extra width of pavement and minimum turning radius width of shoulders and parking facilities clearance to be provided under structures such as overrides, under-bridges The maximum width of a vehicle as recommended by IIRC is a) 1. Mm 2. 44 m 3. 81 m 4. 2 m Desire lines are plotted in traffic volume studies speed studies accident studies origin and destination studies Which of the following methods is preferred for collecting origin and destination data for a small area like a mass business center or a large intersection ? ) road side interview method b) license plate method c) return postcard method d) home interview method 50. The diagram which shows the approximate path of vehicles and pedestrians involved in accidents is known as a) spot maps b) pie charts c) condition diagram d) collision diagram 51. With increase in speed of the traffic stream, the minimum spacing of vehicles a) Increases b) decreases c) first decreases and then increases after reaching a minimum value at optimum speed d) first increases and then decreases after reaching a maximum value at optimum speed 52. Which of the following is known as design capacity ? Asia capacity theoretical capacity possible capacity 53. If the average center to center spacing of vehicles is 20 meters, then the basic capacity of a traffic lane at a speed of 50 Kemp is 54. 2500 vehicles per day 2000 vehicles per hour 2500 vehicles per hour 1000 vehicles per hour With increase in speed of the traffic stream, the maximum capacity of the lane decreases iris increases and then decreases after reaching a maximum value at optimum speed d) first decreases and then increases after reaching a minimum value at Equivalent factor of passenger car unit (PUC) for a passenger car as per IIRC is 55. . 0 2. 0 0. 5 10 56. If the stopping distance and average length of a vehicle are 18 m and 6 m respectively, then the theoretical maxi-mum capacity of a traffic lane at a speed of 10 m/sec is a) 1500 vehicles per hour b) 2000 vehicles per hour c) 2500 vehicles per hour d) 3000 vehicles per hour 57.

Scientific planning of transportation system and mass transit facilities in cities would be based on a) spot speed data b) origin and destination data c) traffic volume data d) accident data 58. The diagram which shows all important physical conditions of an accident location like roadway limits, bridges, trees and all details of roadway conditions is known as a) pie chart b) spot maps 59.

When the speed of traffic flow becomes zero,then a) traffic density attains maximum value whereas traffic volume becomes zero b) traffic density and traffic volume both attain maximum value c) traffic density and traffic volume both become zero 60. On a right angled road intersection with two way traffic, the total number of inflict points is a) 6 61. 62. 63. 64. 65. 11 18 24 The background color of the informatory sign board is a) yellow green white Which of the following is indicated by a warning sign ? ) no parking end of speed limit overtaking prohibited “Dead Slow” is a regulatory sign warning sign informatory sign The most efficient traffic signal system is simultaneous system alternate system flexible progressive system simple progressive system The provision of traffic signals at intersections reduces right angled and rear end collisions increases right angled and rear end collisions red level crossing educes right angled collisions but may increase rear end collisions d) reduces rear end collisions but may increase right angled collisions 66.

Select the incorrect statement. A) Stop or red time off signal is the sum of go and clearance intervals for the cross flow. B) Go or green time off signal is the sum of stop and clearance intervals for the cross flow. C) Clearance time is generally 3 to 5 seconds. D) The cycle length is normally 40 to 60 seconds for two phase signals. To designate traffic lanes in roadways meant for two way traffic to indicate that overtaking is not permitted o designate proper lateral placement of vehicles before turning to different directions 68.

The particular places where pedestrians are to cross the pavement are properly marked by the pavement marking known as stop lines turn markings crosswalk lines lane lines 69. The entrance and exit curves of a rotary have a) equal radii and equal widths of pavement b) equal radii but pavement width is more at entrance than at exit curve c) pavement widths but radius is more at entrance curve than at exit curve d) different radii and different widths of pavement equal 70. When two equally important roads cross roughly at right angles, the suitable happen of central island is a) circular b) elliptical c) tangent d) turbine 71.

The maximum number of vehicles beyond which the rotary may not function efficiently is a) 500 vehicles per hour 72. 500 vehicles per day 5000 vehicles per hour 5000 vehicles per day A traffic rotary is Justified where number of intersecting roads is between 4 and 7 space is limited and costly when traffic volume is less than 500 vehicles per hour d) when traffic volume is more than 5000 vehicles per hour 73. When a number of roads are meeting at a point and only one of the roads is important, then the suitable shape of rotary is a) circular b) tangent