Traffic Operations and Traffic Signals - IES Previous Year Questions

11. The type of signalling system in which it is possible to vary the length of cycle, cycle division and the time schedule at each signal point is called _____ .

[IES 2017]

  1. Alternate system
  2. Simple progressive system
  3. Flexible progressive system
  4. Simultaneous system
Answer: Option C
Explanation:
In a flexible progressive system, it is possible to vary the cycle length, cycle division and the time schedule at each signalised intersection.

12. When properly designed traffic signals are used, which one of the following is the advantage of traffic signals ?

[IES 2021]

  1. The signals allow crossing of the heavy traffic flow with safety.
  2. The rear-end collision may increase.
  3. Improper design and location of signals may lead to violation of the control systems. 
  4. Failure of the signal due to electric power failure may cause confusion to the road users.
Answer: Option A
Explanation:
The advantages of traffic signals are as follows:
  • Provides orderly movement of traffic.
  • Increases the traffic handling capacity of the intersections at grade.
  • Reduces right angled collision.
  • Ensures safe crossing of roads by the pedestrians and more.

13.  In traffic control, the speed at which vehicles are presumed to travel through the coordinated signal system is known as _____ .

[IES 2022]

  1. Speed of progression
  2. Cycle
  3. Through band
  4. Signal coordination
Answer: Option A
Explanation:
Progression speed is the speed at which vehicles are presumed to travel through a coordinated signal system.
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