3/15/2010 Lesson Title Approximate Module 2 Time (minutes) - - PDF document

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3/15/2010 Lesson Title Approximate Module 2 Time (minutes) - - PDF document

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3/15/2010 Lesson Title Approximate Module 2 Time (minutes) Effect of Detector and Timing Parameters on 1 How a traffic phase times 20 the Operation of the Cross Street of an 2 Effect of detection zone length on green 30 duration

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SLIDE 1

3/15/2010 1

Module 2 Effect of Detector and Timing Parameters on the Operation of the Cross Street of an Isolated Intersection

Lesson Title Approximate Time (minutes) 1 How a traffic phase times 20 2 Effect of detection zone length on green duration 30 3 Determining the length of the Minimum Green 15 3 Determining the length of the Minimum Green time 15 4 Observing vehicle headways in the departing queue 20 5 Relating headway to unoccupancy time and Vehicle Extension time 30 6 Design exercise- setting the Minimum Green time and the Vehicle Extension time 45 Closure: S ummary of key points learned 15

2

Learning Outcomes

  • Be able to describe the relationship between

– Detection zone length – Detector location – Vehicle Extension time – Minimum Green time

  • Be able to determine

– Duration of Minimum Green time – Vehicle Extension time – Given length and placement of detector.

3

Lesson 1 How a Traffic Phase Time

  • Learning outcomes
  • Overview
  • Questions to consider
  • S

teps

4

Running the Experiment

  • S

tep 1. Open movie file

  • S

tep 2. Observe status at beginning of Phase 4 green

  • S

tep 3. Observe two scenarios for one green indication

  • S

tep 4. S ummarize your observations

5

Running the Experiment

For phase 4: “T” indicates phase is timing; “C” indicates an active call

  • n the phase.

For ring 1/phase 4: Minimum Green timer has a current value of 5.0 sec; Maximum 1 Green timer has a current value of 0 0 sec

6

a current value of 0.0 sec.

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SLIDE 2

3/15/2010 2

Considering the Questions

  • Why does phase terminate for each scenario?
  • What is process followed by Minimum Green timer?
  • What is process followed by Vehicle Extension timer?
  • What is process followed by Maximum Green timer?
  • What are two conditions for termination of green?

7

Question 1

  • Why does phase terminate for each scenario?

8

Question 2

  • What is process followed by Minimum Green timer?

9

Question 2

  • What is process followed

by Minimum Green timer?

10

Question 3

  • What is process followed by Vehicle Extension timer?

11

Question 3

  • What is process followed

by Vehicle Extension timer?

12

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SLIDE 3

3/15/2010 3

Question 4

  • What is process followed by Maximum Green timer?

13

Question 4

  • What is process followed

by Maximum Green timer?

Maximum Green timer

Maximum Green timer setting

14

Question 5

  • What are two conditions that cause termination of

green?

15

Question 5

  • What are two conditions that cause termination of

green?

16

Question 5

  • What are two conditions that cause termination of

green?

3 4 5 17 1 2 45 50 55 60 65 70 75 0.0 0.5 1.0 1.5 2.0 2.5 45 50 55 60 65 70 75

Question 5

  • What are two conditions that cause termination of

green?

1 2 3 4 5 18 45 50 55 60 65 70 75 0.0 0.5 1.0 1.5 2.0 2.5 45 50 55 60 65 70 75 10 20 45 50 55 60 65 70 75

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SLIDE 4

3/15/2010 4

Lesson 2 Effect of Detection Zone Length on Green Duration

  • Learning outcomes
  • Overview
  • Questions to consider
  • S

teps

19

Running the Experiment

  • S

tep 1. S tart MOS T software and open input files

  • S

tep 2. Note information in simulation windows

  • S

tep 3. S tart simulation

  • S

tep 4. Observe simulation at t = 49.1

  • S

tep 5. Observe simulation at t = 49.9

  • S

tep 6. Observe simulation from t = 54.0 to 54.3

  • S

tep 7. Observe simulation from t = 60.1 to 61.4

20

Running the Experiment

  • S

tep 1. S tart MOS T software and open input files

21

Running the Experiment

  • S

tep 2. Note information in simulation windows

22

Considering the Questions

  • When is detector active; when is it inactive?
  • When does the phase terminate?
  • Why does the phase terminate?
  • Is the phase operating efficiently or not?
  • Is quality of service provided good or not?
  • If phase terminates too early or extends too long, what

solutions should be considered?

23

Question 1

  • When is detector active; when is it inactive?

24

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SLIDE 5

3/15/2010 5

Question 1

  • When is detector active; when is it inactive?

25

Question 2

  • When does the phase terminate?

26

Question 2

  • When does the phase terminate?

27

Question 3

  • Why does the phase terminate?

28

Question 3

  • Why does the phase terminate?

29

Question 3

  • Why does the phase terminate?

30

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SLIDE 6

3/15/2010 6

Question 4

  • Is the phase operating efficiently or not?

31

Question 5

  • Is quality of service good or not?

32

Question 6

  • If phase terminates too early or extends too long, what

solutions should be considered?

33

Question 6

  • If phase terminates too early or extends too long, what

solutions should be considered?

34

Lesson 3 Determining Length Of Minimum Green Time

  • Learning outcome
  • Overview
  • Questions to consider
  • S

teps

35

Running the Experiment

  • S

tep 1. S tart MOS T software tool and open input files

  • S

tep 2. Verify signal timing settings in AS C/ 3 controller have been correctly set for phase 4

36

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SLIDE 7

3/15/2010 7

Running the Experiment

  • S

tep 3. Observe traffic conditions and controller status at end of red for phase 2

  • S

tep 4. Observe timing and termination of S B phase for two scenarios, using “ Run Mode S ingle S tep”

  • S

tep 5 Observe vehicle start ups using “ Run Mode

  • S

tep 5. Observe vehicle start -ups, using Run Mode S ingle S tep” process (S cenario 1 only, left side)

37

Considering the Questions

  • When is Minimum Green time too long?
  • How long should Minimum Green time be in order to get

vehicles moving during early portion of green?

  • What are respective roles of Minimum Green time and

Vehicle Extension time in producing efficient Vehicle Extension time in producing efficient

  • perations?

38

Question 1

  • When is Minimum Green time too long?

39

Question 1

  • When is Minimum Green time too long?

40

Question 1

  • When is Minimum Green time too long?

41

Question 2

  • How long should Minimum Green time be in order to get

vehicles moving during early portion of green?

42

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SLIDE 8

3/15/2010 8

Question 2

  • How long should Minimum Green time be in order to get

vehicles moving during early portion of green?

43

Question 2

  • How long should Minimum Green time be in order to get

vehicles moving during early portion of green?

44

Question 2

  • How long should Minimum Green time be in order to get

vehicles moving during early portion of green?

45

Question 3

  • What are respective roles of Minimum Green time and

Vehicle Extension time in producing efficient

  • perations?

46

Lesson 4 Observing Vehicles Headways in Departing Queue

  • Learning outcomes
  • Overview
  • Questions to consider
  • S

teps S teps

47

Running the Experiment

  • S

tep 1. S tart MOS T software and open input file

  • S

tep 2. Observe and record headways for one cycle

48

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SLIDE 9

3/15/2010 9

Considering the Questions

  • How much variation is there in headways between

vehicles in departing queue?

  • Based on headways that you observed in departing

queue, what is your recommendation for desired maximum headway? maximum headway?

49

Question 1

  • How much variation is there in headways between

vehicles in departing queue?

50

Question 1

  • How much variation is there in headways between

vehicles in departing queue?

51

Question 2

  • Based on headways that you observed in departing

queue, what is your recommendation for desired maximum headway?

52

Question 2

  • Based on headways that you observed in departing

queue, what is your recommendation for desired maximum headway?

53

Relationship between Unoccupancy time and Vehicle Extension

  • S

hort detection zone

54

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SLIDE 10

3/15/2010 10

Relationship between Unoccupancy time and Vehicle Extension

  • Long detection zone

55

Lesson 5 Relating Headway to Unoccupancy Time and Vehicle Extension Time

  • Learning outcomes
  • Overview
  • Questions to consider

S

  • S

teps

56

Running the Experiment

  • S

tep 1. S tart MOS T software and open input file

  • S

tep 2. Collect data

57

Considering the questions

  • What is your recommendation for Vehicle Extension

time, based on your recommended desired maximum headway?

  • If detection zone length was longer than 22 feet, would

your recommended Vehicle Extension time value be your recommended Vehicle Extension time value be higher or lower?

58

Relationship between Headway and Unoccupancy time

  • Data collection Table

59

Relationship between Headway and Unoccupancy time

60

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SLIDE 11

3/15/2010 11

Question 1

  • What is your recommendation for Vehicle Extension

time, based on your recommended desired maximum headway?

61

Question 2

  • If detection zone length was longer than 22 feet, would

your recommended Vehicle Extension time value be higher or lower?

62

Lesson 6 Design Exercise – Setting Minimum Green time and Vehicle Extension time

  • Learning outcome
  • Overview
  • Questions to consider
  • S

teps

63

Running the Experiment

  • S

tep 1. S tart MOS T software tool and open input file

  • S

tep 2. Observe simulation of S B approach with given values of Minimum Green time and Vehicle Extension time

  • S

tep 3. Experiment with Minimum Green time setting for phase 4

64

Running the Experiment

  • S

tep 4. Experiment with Vehicle Extension time setting for phase 4

  • S

tep 5. Continue to experiment with values of two timing parameters until you reasonably meet criteria

  • S

tep 6. Prepare j ustification of your recommended parameters

65

Considering the questions

  • What are primary characteristics of traffic streams for

each of four cycles that will affect settings for Minimum Green time and Vehicle Extension time?

  • What changes did you make to given settings?
  • What are trade offs in setting values for two timing
  • What are trade-offs in setting values for two timing

parameters?

  • Have you met criteria established?

66

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SLIDE 12

3/15/2010 12

Question 1

  • What are primary characteristics of traffic streams for

each of four cycles that will affect settings for Minimum Green time and Vehicle Extension time?

67

Question 2

  • What changes did you make to given settings?

68

Question 2

  • What changes did you make to given settings?

69

Question 2

  • What changes did you make to given settings?

70

Question 2

  • What changes did you make to given settings?

71

Question 3

  • What are trade-offs in setting values for two timing

parameters?

72

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SLIDE 13

3/15/2010 13

Question 4

  • Have you met criteria established?

73

Closure: Summary of Key Points Learned

74