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Q: Which of the following is/are NOT the characteristic of traffic actuated signals? i. It is costly. ii. The cycle time changes as per traffic demand. iii. The cycle time changes as per the time of the day. iv. Computers and detectors are used to operate this signal.
  • A. Both ii and iv
  • B. Both iii and iv
  • C. Only iii
  • D. Only ii
Correct Answer: Option C - Traffic actuated signals– • The main characteristic of the traffic-actuated signal is that it recognizes the demand of the flow of traffic and distributors the time cycle or the green time accordingly. • Time cycle is the number of seconds required for one complete sequence of signal indication that is green-yellow-red. Its main advantage are the following– (i) Usually reduces delay. (ii) It is adaptable to short-term fluctuation in traffic. (iii) Usually increase the capacity. (iv) It provides continuous operation under low volume conditions and is specially effective at multiple phase intersection. Generally it is most efficient for isolated intersections. Its main disadvantages are– (i) It is uneconomical (ii) The actuated controller and detectors are much more complicated than fixed time controllers, thus increasing the maintenance and inspection costs. (iii) Detectors are very costly to install and present very difficult maintenance problems.
C. Traffic actuated signals– • The main characteristic of the traffic-actuated signal is that it recognizes the demand of the flow of traffic and distributors the time cycle or the green time accordingly. • Time cycle is the number of seconds required for one complete sequence of signal indication that is green-yellow-red. Its main advantage are the following– (i) Usually reduces delay. (ii) It is adaptable to short-term fluctuation in traffic. (iii) Usually increase the capacity. (iv) It provides continuous operation under low volume conditions and is specially effective at multiple phase intersection. Generally it is most efficient for isolated intersections. Its main disadvantages are– (i) It is uneconomical (ii) The actuated controller and detectors are much more complicated than fixed time controllers, thus increasing the maintenance and inspection costs. (iii) Detectors are very costly to install and present very difficult maintenance problems.

Explanations:

Traffic actuated signals– • The main characteristic of the traffic-actuated signal is that it recognizes the demand of the flow of traffic and distributors the time cycle or the green time accordingly. • Time cycle is the number of seconds required for one complete sequence of signal indication that is green-yellow-red. Its main advantage are the following– (i) Usually reduces delay. (ii) It is adaptable to short-term fluctuation in traffic. (iii) Usually increase the capacity. (iv) It provides continuous operation under low volume conditions and is specially effective at multiple phase intersection. Generally it is most efficient for isolated intersections. Its main disadvantages are– (i) It is uneconomical (ii) The actuated controller and detectors are much more complicated than fixed time controllers, thus increasing the maintenance and inspection costs. (iii) Detectors are very costly to install and present very difficult maintenance problems.