The average number of vehicles overtaking the test vehicle is 100 and the number of vehicles overtaken by the test vehicle is 44. The flow of vehicles in one direction of stream is 14 veh/min. The average journey time of test vehicle travelling with the stream is 6.5 min. Estimate the average journey time for all the vehicles in a traffic stream in the direction of flow.
- A2.1 min
- B2.3 min
- C2.5 minCorrect
- D2.7 min
Solution
Concept
Average journey time
Formula
T = tw − y/q
Step-by-step solution
1. y = 100 − 44 = 56. 2. T = 6.5 − 56/14 = 2.5 min.
Explanation
The test vehicle's journey time is corrected by net overtakings.
Why the other options are wrong
Others do not follow.
Shortcut
tw − y/q.
Correct answer: C) 2.5 min