41.8. Problems

Try these first

1. 1.

   What is effective green time if green time is 35 seconds, yellow is 5 seconds, and lost time is 4 seconds?

   Hint

   Remember the formula g = G + Y - L.

2. 2.

   How do you calculate saturation flow rate from the saturation headway?

   Hint

   Use the formula s = 3600/h.

3. 3.

   What is the definition of effective green time?

   Hint

   Remember the formula related to green time.

4. 4.

   True or False: Saturation flow rate is a measure of how many vehicles can pass a point per hour.

   Hint

   Think about the maximum flow concepts.

5. 5.

   A traffic signal has 3 phases with a total green time of 90 seconds, a yellow time of 10 seconds, and lost times totaling 6 seconds. Determine the cycle length needed for effective flow?

   Hint

   Use the detailed structural formulas provided.

6. 6.

   In a scenario with a peak hour traffic volume of 2000 vehicles per hour, find the required saturation flow rate to manage this volume effectively using the given headway.

   Hint

   What measures do you need to increase the effective flow?