3/15/2010 Module 3 Lesson Title Approximate Developing Timing Plans for Efficient Intersection Time (minutes) Operations During Moderate Traffic Volume 1 Determining the effect of minor street 30 Vehicle Extension time on intersection Conditions operations 2 Determining pedestrian timing parameters g p g p 30 3 Determining the effect of Maximum Green 30 time on intersection operations 4 Design exercise- setting timing parameters for 45 both approaches of an intersection Closure: S ummary of key points learned 10 2 Lesson 1 Learning Outcomes Determining The Effect Of Minor Street Vehicle Extension Time On Intersection Operations • Be able to compare the operation of the intersection • Learning outcome with low and high values of Vehicle Extension time and • Overview understand the consequences of both alternatives. • Questions to consider • Be able to determine the effect of the minor street • S teps Vehicle Extension time setting on the efficiency of Vehicle Extension time setting on the efficiency of maj or street and intersection operations. • Be able to determine pedestrian timing parameters using MUTCD procedures. • Be able to determine the maximum green time and understand it’s effect on intersection operations 3 4 Running the Experiment Running the Experiment • S tep 1. Open the movie file. • S tep 2. Adj ust play speed setting. 5 6 1
3/15/2010 Data Collection Table for queue and display Considering the Questions status for Case 1 • How do the EB and S B approach queue lengths vary given the two Vehicle Extension time values used for the S B approach? • How does an increase in the S B approach Vehicle Extension affect the EB green interval duration? Extension affect the EB green interval duration? • How does the increase in the S B approach Vehicle Extension affect the cycle length? • What effect does the Vehicle Extension time have on the delay experienced for these two cases? 7 8 Data Collection Table for queue and display Data Summary status for Case 2 SB Approach EB Approach 9 10 Mean Values for Case 1 and Case 2 Question 1 • How do the EB and S B approach queue lengths vary given the two Vehicle Extension time values used for the S B approach? 11 12 2
3/15/2010 Queue lengths for SB approach Queue Lengths for EB approach 13 14 Question 2 Question 3 • How does an increase in the S B approach Vehicle • How does the increase in the S B approach Vehicle Extension affect the EB green interval duration? Extension affect the cycle length? 15 16 Question 4 Delay for SB approach • What effect does the Vehicle Extension time have on the delay experienced for these two cases? 17 18 3
3/15/2010 Delay for EB approach Total delay estimation for SB and EB approaches 19 20 Average delay for SB and EB approaches Highway Capacity Manual Equation 21 22 Queue length vs. Time for cases 1 and 2 Delay for cases 1 and 2 23 24 4
3/15/2010 Lesson 2 Running the Experiment Determining Pedestrian Timing Parameters • Learning outcome • S tep 1. Compute the pedest rian clearance interval. • • Overview S tep 2. S tart the MOS T software tool and open the input file. • Questions to consider • S tep 3. Enter the pedest rian timing parameters. • S teps • S S t tep 4. Observe the pedestrian and vehicle timing 4 Ob th d t i d hi l ti i processes for one green interval. • S tep 5. Observe the S B approach (phase 4) for two green intervals. 25 26 Considering the Questions Question 1 • What duration of the pedestrian clearance interval do • What duration of the pedestrian clearance interval do you recommend? you recommend? • What are the components of the pedestrian timing process and how do they relate to the concurrent vehicle timing process components. vehicle timing process components • What effect do the pedestrian timing parameters have on the duration of the green indication? 27 28 Question 1 Question 2 • • What duration of the pedestrian clearance interval do What are the components of the pedestrian timing you recommend? process and how do they relate to the concurrent vehicle timing process components. 29 30 5
3/15/2010 Question 2 Question 2 T = 14.4 T = 19.4 31 32 Question 3 Question 3 • What effect do the pedestrian timing parameters have • What effect do the pedestrian timing parameters have on the duration of the green indication? on the duration of the green indication? 33 34 Lesson 3 Determining The Effect Of Maximum Green Running the Experiment Time On Intersection Operations • • Learning outcome S tep 1. Open the movie file • Overview • S tep 2. Observe the operation of case 1 and record your observations. • Questions to consider • S tep 3. Observe the operation of case 2 and record your • S teps observations observations. • S tep 4. Identify the pros and cons of the two different maximum green time settings on the westbound approach and on the overall performance of the intersection. 35 36 6
3/15/2010 Data Collected Considering the Questions Green Interval Durations for case 1 and 2 • Are all of the vehicles in the initial queue on the EB approach served before the end of each green interval? • What is the mechanism for termination of the phase serving the westbound approach? • What are the advantages and disadvantages of the 40 g g second maximum green time for the operation of case 1? • What are the advantages and disadvantages of the 60 second maximum green time for the operation of case 2? • Which maximum green time setting would you select and why? 37 38 Variation of Green Time with Maximum Green Variation of Delay with Maximum Green 80 40 duration, sec 60 30 c/veh Delay, sec Green interval d 40 20 20 10 0 0 0 20 40 60 80 0 20 40 60 80 Maximum green, sec Maximum green, sec 39 40 Question 1 Question 1 • Are all of the vehicles in the initial queue on the EB approach served before the end of each green interval? 41 42 7
3/15/2010 Question 2 Question 3 • What is the mechanism for termination of the phase • What are the advantages and disadvantages of the 40 serving the westbound approach? second maximum green time for the operation of case 1? 43 44 Question 4 Question 5 • What are the advantages and disadvantages of the 60 • Which maximum green time setting would you select second maximum green time for the operation of case and why? 2? 45 46 Lesson 4 Running the Experiment Design Exercise- Setting Timing Parameters For Both Approaches Of An Intersection • S tep 1. S tart the MOS T software tool and open the • Learning outcome input file. • Overview • S tep 2. Observe the simulation of both intersection • Questions to consider approaches using the given values of Minimum Green • S S teps teps time and Vehicle Extension time time and Vehicle Extension time. • S tep 3. Experiment with the Minimum Green time setting for phases 2 and 4. • S tep 4. Experiment with the Vehicle Extension time setting for phases 2 and 4. 47 48 8
3/15/2010 Running the Experiment Considering the Questions • S tep 5. Experiment with the Maximum Green time • What are the indicators of inefficient intersection setting for phases 2 and 4. operations? What are the indicators of efficient operations? • S tep 6. Continue to experiment with the values of these three timing parameters until you reasonably • Based on your observations of the conditions for this meet the criteria listed below meet the criteria listed below. experiment what specific changes would you make to experiment, what specific changes would you make to the given signal timing settings? • S tep 7. Prepare a j ustification of your recommended • parameters. After implementing these changes, did you meet the criteria established in S ection 6.2? 49 50 Question 1 Question 2 • What are the indicators of inefficient intersection • Based on your observations of the conditions for this operations? What are the indicators of efficient experiment, what specific changes would you make to operations? the given signal timing settings? 51 52 Question 2 Question 2 53 54 9
3/15/2010 Question 2 Question 3 • After implementing these changes, did you meet the criteria established in S ection 6.2? 55 56 Closure: Summary Of Key Points Learned • Be able to compare operation of intersection with low and high values of Vehicle Extension time and understand consequences of both alternatives. • Be able to determine effect of minor street Vehicle Extension time setting on efficiency of maj or street and intersection operations. • B bl Be able to determine pedestrian timing parameters d i d i i i using Manual of Uniform Traffic Control Devices (MUTCD) procedures. • Be able to determine Maximum Green time and understand effect on intersection operations. • Be able to set timing parameters (Minimum Green time, Vehicle Extension time, and Maximum Green time) for both approaches of intersection. 57 10
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