A two-phase signalized intersection is designed with a cycle time of 100 s. The amber and red times for each phase are 4 s and 50 s, respectively. If the total lost time per phase due to start-up and clearance is 2 s, the effective green time of each phase is _________ s. (in integer)
At a traffic intersection, cars and buses arrive randomly according to independent Poisson processes at an average rate of 4 vehicles per hour and 2 vehicles per hour, respectively. The probability of observing at least 2 vehicles in 30 minutes is __________. (round off to two decimal places)
The vehicle count obtained in every 10 minute interval of a traffic volume survey done in peak one hour is given below.
| Time Interval (in minutes) | Vehicle Count |
|---|---|
| 0 - 10 | 10 |
| 10 - 20 | 11 |
| 20 - 30 | 12 |
| 30 - 40 | 15 |
| 40 - 50 | 13 |
| 50 - 60 | 11 |
The peak hour factor (PHF) for 10 minute sub-interval is _____________. (round off to one decimal place)