42.4. Performance Measures

Try these first

1. 1.

   What is stopped delay?

   Hint

   Think about what happens when you have to stop at a traffic light.

2. 2.

   Define queue length.

   Hint

   Consider how many cars are lined up at a stoplight.

3. 3.

   What is the main component of delay at an intersection?

   • Travel Time
   • Stopped Time
   • Both Stopped and Travel Time

   Hint

   Consider what contributes to waiting time.

4. 4.

   True or False: Webster's model assumes that vehicles arrive in a random pattern.

   • True
   • False

   Hint

   Reflect on the assumptions that simplify traffic modeling.

5. 5.

   Calculate the total delay per cycle at an intersection where the cycle length is 120 seconds, effective green time is 70 seconds, critical flow is 600 vehicles/hour, and saturation flow is 1800 vehicles/hour.

   Hint

   Break down the equation and substitute values step by step.

6. 6.

   Discuss the impact of reducing average delay at a traffic signal on vehicle emissions and driver behavior.

   Hint

   Consider environmental and psychological aspects.