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
Ans: a
52. Which of the following is known as design capacity ?
a) basic capacity
b) theoretical capacity
c) possible capacity
d) practical capacity
Ans: a
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 kmph is
a) 2500 vehicles per day
b) 2000 vehicles per hour
c) 2500 vehicles per hour
d) 1000 vehicles per hour
Ans: c
54. With increase in speed of the traffic stream, the maximum capacity of the lane
a) increases
b) decreases
c) first increases and then decreases after reaching a maximum value at optimum speed
d) first decreases and then increases after reaching a minimum value at optimum speed
Ans: c
55. Equivalent factor of passenger car unit (PCU) for a passenger car as per IRC is
a) 1.0
b) 2.0
c) 0.5
d) 10
Ans: a
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
Ans: a
57. Scientific planning of transportation system and mass transit facilities in cities should be based on
a) spot speed data
b) origin and destination data
c) traffic volume data
d) accident data
Ans: b
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
c) condition diagram
d) collision diagram
Ans: c
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
d) traffic density becomes zero whereas traffic volume attains maximum value
Ans: a
60. On a right angled road intersection with two way traffic, the total number of conflict points is
a) 6
b) 11
c) 18
d) 24
Ans: d
61. The background colour of the informatory sign board is
a) red
b) yellow
c) green
d) white
Ans: b
62. Which of the following is indicated by a warning sign ?
a) level crossing
b) no parking
c) end of speed limit
d) overtaking prohibited
Ans: a
63. “Dead Slow” is a
a) regulatory sign
b) warning sign
c) informatory sign
d) none of the above
Ans: a
64. The most efficient traffic signal system is
a) simultaneous system
b) alternate system
c) flexible progressive system
d) simple progressive system
Ans: c
65. The provision of traffic signals at intersections
a) reduces right angled and rear end collisions
b) increases right angled and rear end collisions
c) reduces right angled collisions but may increase rear end collisions
d) reduces rear end collisions but may increase right angled collisions
Ans: c
66. Select the incorrect statement.
a) Stop or red time of a signal is the sum of go and clearance intervals for the cross flow.
b) Go or green time of a 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.
Ans: b
67. Centre line markings are used
a) to designate traffic lanes
b) in roadways meant for two way traffic
c) to indicate that overtaking is not permitted
d) to designate proper lateral placement of vehicles before turning to different directions
Ans: b
68. The particular places where pedestrians are to cross the pavement are properly marked by the pavement marking known as
a) stop lines
b) turn markings
c) crosswalk lines
d) lane lines
Ans: c
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) equal pavement widths but radius is more at entrance curve than at exit curve
d) different radii and different widths of pavement
Ans: d
70. When two equally important roads cross roughly at right angles, the suitable shape of central island is
a) circular
b) elliptical
c) tangent
d) turbine
Ans: a
71. The maximum number of vehicles beyond which the rotary may not function efficiently is
a) 500 vehicles per hour
b) 500 vehicles per day
c) 5000 vehicles per hour
d) 5000 vehicles per day
Ans: c
72. A traffic rotary is justified where
a) number of intersecting roads is between 4 and 7
b) space is limited and costly
c) when traffic volume is less than 500 vehicles per hour
d) when traffic volume is more than 5000 vehicles per hour
Ans: a
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
c) elliptical
d) turbine
Ans: b
74. Maximum number of vehicles can be parked with
a) parallel parking
b) 30° angle parking
c) 45° angle parking
d) 90° angle parking
Ans: d
75. When the width of kerb parking space and width of street are limited, generally preferred parking system is
a) parallel parking
b) 45° angle parking
c) 65° angle parking
d) 90° angle parking
Ans: a