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 Isolated Intersection 3 3 Determining the length of the Minimum Green 15 Determining the length of the Minimum Green 15 time 4 Observing vehicle headways in the departing 20 queue 5 Relating headway to unoccupancy time and 30 Vehicle Extension time 6 Design exercise- setting the Minimum Green 45 time and the Vehicle Extension time Closure: S ummary of key points learned 15 2 Lesson 1 Learning Outcomes How a Traffic Phase Time • Be able to describe the relationship between • Learning outcomes – Detection zone length • Overview – Detector location • Questions to consider – Vehicle Extension time • S teps – Minimum Green time • Be able to determine – Duration of Minimum Green time – Vehicle Extension time – Given length and placement of detector. 3 4 Running the Experiment Running the Experiment For phase 4: “T” indicates phase is timing; • S tep 1. Open movie file “C” indicates an active call on the phase. • S tep 2. Observe status at beginning of Phase 4 green For ring 1/phase 4: • S tep 3. Observe two scenarios for one green indication Minimum Green timer has a current value of 5.0 sec; • S tep 4. S ummarize your observations Maximum 1 Green timer has a current value of 0 0 sec a current value of 0.0 sec. 5 6 1
3/15/2010 Considering the Questions Question 1 • Why does phase terminate for each scenario? • 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 8 Question 2 Question 2 • What is process followed by Minimum Green timer? • What is process followed by Minimum Green timer? 9 10 Question 3 Question 3 • • What is process followed by Vehicle Extension timer? What is process followed by Vehicle Extension timer? 11 12 2
3/15/2010 Question 4 Question 4 • What is process followed by Maximum Green timer? • What is process followed Maximum Green timer setting Green timer Maximum by Maximum Green timer? 13 14 Question 5 Question 5 • What are two conditions that cause termination of • What are two conditions that cause termination of green? green? 15 16 Question 5 Question 5 • • What are two conditions that cause termination of What are two conditions that cause termination of green? green? 5 4 5 3 4 2 3 1 0 0 2 45 50 55 60 65 70 75 1 2.5 0 2.0 45 50 55 60 65 70 75 1.5 1.0 2.5 0.5 0.0 2.0 45 50 55 60 65 70 75 1.5 1.0 20 0.5 10 0.0 45 50 55 60 65 70 75 0 45 50 55 60 65 70 75 17 18 3
3/15/2010 Lesson 2 Running the Experiment Effect of Detection Zone Length on Green Duration • Learning outcomes • S tep 1. S tart MOS T software and open input files • • Overview S tep 2. Note information in simulation windows • Questions to consider • S tep 3. S tart simulation • S teps • 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 19 20 Running the Experiment Running the Experiment • S tep 1. S tart MOS T software and open input files • S tep 2. Note information in simulation windows 21 22 Considering the Questions Question 1 • • When is detector active; when is it inactive? 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 24 4
3/15/2010 Question 1 Question 2 • When is detector active; when is it inactive? • When does the phase terminate? 25 26 Question 2 Question 3 • When does the phase terminate? • Why does the phase terminate? 27 28 Question 3 Question 3 • • Why does the phase terminate? Why does the phase terminate? 29 30 5
3/15/2010 Question 4 Question 5 • Is the phase operating efficiently or not? • Is quality of service good or not? 31 32 Question 6 Question 6 • If phase terminates too early or extends too long, what • If phase terminates too early or extends too long, what solutions should be considered? solutions should be considered? 33 34 Lesson 3 Running the Experiment Determining Length Of Minimum Green Time • • Learning outcome S tep 1. S tart MOS T software tool and open input files • Overview • S tep 2. Verify signal timing settings in AS C/ 3 controller have been correctly set for phase 4 • Questions to consider • S teps 35 36 6
3/15/2010 Running the Experiment Considering the Questions • S tep 3. Observe traffic conditions and controller status • When is Minimum Green time too long? at end of red for phase 2 • How long should Minimum Green time be in order to get • S tep 4. Observe timing and termination of S B phase for vehicles moving during early portion of green? two scenarios, using “ Run Mode S ingle S tep” • What are respective roles of Minimum Green time and • • S S tep 5. Observe vehicle start -ups, using Run Mode tep 5 Observe vehicle start ups using “ Run Mode Vehicle Extension time in producing efficient Vehicle Extension time in producing efficient S ingle S tep” process (S cenario 1 only, left side) operations? 37 38 Question 1 Question 1 • When is Minimum Green time too long? • When is Minimum Green time too long? 39 40 Question 1 Question 2 • • 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? 41 42 7
3/15/2010 Question 2 Question 2 • How long should Minimum Green time be in order to get • How long should Minimum Green time be in order to get vehicles moving during early portion of green? vehicles moving during early portion of green? 43 44 Question 2 Question 3 • How long should Minimum Green time be in order to get • What are respective roles of Minimum Green time and vehicles moving during early portion of green? Vehicle Extension time in producing efficient operations? 45 46 Lesson 4 Running the Experiment Observing Vehicles Headways in Departing Queue • S tep 1. S tart MOS T software and open input file • Learning outcomes • S tep 2. Observe and record headways for one cycle • Overview • Questions to consider • S S teps teps 47 48 8
3/15/2010 Considering the Questions Question 1 • How much variation is there in headways between • How much variation is there in headways between vehicles in departing queue? vehicles in departing queue? • Based on headways that you observed in departing queue, what is your recommendation for desired maximum headway? maximum headway? 49 50 Question 1 Question 2 • How much variation is there in headways between • Based on headways that you observed in departing vehicles in departing queue? queue, what is your recommendation for desired maximum headway? 51 52 Relationship between Unoccupancy time and Question 2 Vehicle Extension • • Based on headways that you observed in departing S hort detection zone queue, what is your recommendation for desired maximum headway? 53 54 9
3/15/2010 Lesson 5 Relationship between Unoccupancy time and Relating Headway to Unoccupancy Time and Vehicle Extension Vehicle Extension Time • Long detection zone • Learning outcomes • Overview • Questions to consider • S S teps 55 56 Running the Experiment Considering the questions • S tep 1. S tart MOS T software and open input file • What is your recommendation for Vehicle Extension time, based on your recommended desired maximum • S tep 2. Collect data 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? 57 58 Relationship between Headway and Relationship between Headway and Unoccupancy time Unoccupancy time • Data collection Table 59 60 10
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