GATE CE 2015 Set 2 — Question 33
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Transportation Engineering → Intersections & Signals → Traffic Signals
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Question
The following statements are made related to the lengths of turning lanes at signalised intersections:
(i) times the average number of vehicles (by vehicle type) that would store in turning lane per cycle during the peak hour
(ii) times the average number of vehicles (by vehicle type) that would store in turning lane per cycle during the peak hour
(iii) Average number of vehicles (by vehicle type) that would store in the adjacent through lane per cycle during the peak hour
(iv) Average number of vehicles (by vehicle type) that would store in all lanes per cycle during the peak hourAs per the IRC recommendations, the correct choice for design length of storage lanes is:
(i) times the average number of vehicles (by vehicle type) that would store in turning lane per cycle during the peak hour
(ii) times the average number of vehicles (by vehicle type) that would store in turning lane per cycle during the peak hour
(iii) Average number of vehicles (by vehicle type) that would store in the adjacent through lane per cycle during the peak hour
(iv) Average number of vehicles (by vehicle type) that would store in all lanes per cycle during the peak hourAs per the IRC recommendations, the correct choice for design length of storage lanes is:
Correct answer
(B) Maximum of (i and iii)
Solution
According to IRC:93-1985 (Guidelines on Design and Installation of Road Traffic Signals), the storage length for turning lanes should be based on the average number of vehicles stored per cycle during the peak hour. Specifically, it should be at least times the average number of vehicles stored per cycle in the turning lane (Statement i), and in no case should it be less than the average number of vehicles stored per cycle in the adjacent through lane (Statement iii). Thus, the design length is the maximum of (i) and (iii).
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