Well-designed signalized intersection is the one in which i. total delay is minimized ii. cycle time is equal to the sum of red and green times in all phases
- AOnly (i)Correct
- BOnly (ii)
- CBoth (i) and (ii)
- DNeither (i) nor (ii)
Solution
Concept
Design criteria for signalized traffic intersections
Formula
NONE
Step-by-step solution
1. Traffic signal design's primary goal is to minimize total vehicle delay at an intersection. 2. Cycle time includes lost time in addition to red and green signal indications in all phases. 3. Therefore, statement i is correct while statement ii is incorrect. Answer: A
Explanation
A key objective in designing traffic signals is to minimize the total delay experienced by vehicles passing through the intersection. However, cycle time must also include lost time and clearance intervals, so it is not simply equal to the sum of red and green times. Therefore, statement i is correct while statement ii is incorrect, making option A the right choice.
Why the other options are wrong
B) Statement (ii) is false because cycle time includes amber time and lost time. C) Statement (ii) is incorrect, so both statements cannot be valid. D) Statement (i) is correct because minimizing total delay is a primary goal of signalized intersection design.
Shortcut
Signalized intersections minimize total delay, but cycle time includes amber/clearance time in addition to red and green.
Common mistake
Assuming cycle time is only the sum of red and green times without accounting for yellow or clearance intervals, selecting option C.
Correct answer: A) Only (i)