As per IRC guidelines, match the following lists :
| List-I | List-II |
|---|---|
| P.Initial walking time for pedestrian | 1.2·0 seconds |
| Q.Green time required for first vehicle to cross the STOP bar | 2.2·5 seconds |
| R.Reaction time – Overtaking sight distance | 3.6·0 seconds |
| S.Reaction time – Stopping sight distance | 4.7·0 seconds |
Select the correct answer using the code given below :
- A4 3 1 2Correct
- B3 4 1 2
- C3 4 2 1
- D4 3 2 1
Solution
Concept
Standard times used in IRC guidelines
Step-by-step solution
1. Pedestrian initial walking time: 7 seconds → 4. 2. Green time for the first vehicle to cross the stop bar: 6 seconds → 3. 3. Reaction time for overtaking sight distance: 2.0 seconds → 1. 4. Reaction time for stopping sight distance: 2.5 seconds → 2.
Explanation
IRC fixes the perception–reaction time at 2.5 s for stopping sight distance and 2.0 s for overtaking sight distance. For signal timing, a pedestrian start-up time of 7 s and 6 s for the first vehicle are the standard values.
Why the other options are wrong
The other codes swap the 2.0 s and 2.5 s reaction times or swap the signal times.
Shortcut
SSD reaction 2.5 s; OSD reaction 2.0 s; ped initial 7 s.
Common mistake
Interchanging 2.0 s and 2.5 s.
Correct answer: A) 4 3 1 2