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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting SIGNAL TIMING WITHOUT TRAFFIC COUNTS Zong Z. Tian, Ph.D., P.E. University of Nevada, Reno 1 http://unr.edu/homepage/zongt/ Presented by Jim Poston Jim Poston Regional Transportation Commission of Washoe County
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting Overview Signal timing practice Case study My magic tool Results Conclusions 2
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting Signal Timing Practice 3 Turning movement counts (15-30% total cost) Computer model and timing optimization (50~70%) Field implementation and fine tune (10~20%) Timing maintenance (<5%)
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting Coordination parameters 4 Cycle length Phase sequence Phase split Phase offset
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting What Is Really Needed? 5 Phase demand/split How to obtain phase split estimate based on volumes existing timing controller log Existing splits are generally good if no cycle change is needed
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7 Intersection and distance NB
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting Real-world Issues 8 Variable speeds Early releases Wrong offset reference Start or end of coordinated phases TS2-1 st Green or First Ring Signal out of coordination Preemption Pedestrian Loss communication Clock time
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9 Cycle = 120
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10 NB
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting Before-After 11 AfterBefore
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting Before-After 12 AfterBeforeTotal = 4’04”Total = 6’15”
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting Before-After 13 AfterBeforeTotal = 4’04”Total = 6’15”
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting SMRT S ignal M onitoring & R etiming T ool 14
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting 15
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting 16 GPS
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting SMRT 17
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting SMRT 18
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting SMRT 19
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting CONCLUSIONS 20 Signal timing can be done without traffic counts (15%+ saving) Significant improvement by simply changing phasing sequences 15% travel time saving 20~80% saving in stops “Timer” My magic “Timer”
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Transportation Research Group University of Nevada, Reno 2012 ITE District 6 Annual Meeting ? 21
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