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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 Regional Transportation Commission of Washoe County

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SIGNAL TIMING WITHOUT TRAFFIC COUNTS. Presented by Jim Poston Regional Transportation Commission of Washoe County. Zong Z. Tian , Ph.D., P.E. University of Nevada, Reno. http://unr.edu/homepage/zongt/. Overview. Signal timing practice Case study My magic tool Results Conclusions. - PowerPoint PPT Presentation

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Page 1: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity 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

Regional Transportation Commission of Washoe

County

http://unr.edu/homepage/zongt/
Page 2: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

Overview

Signal timing practice

Case study My magic tool

Results

Conclusions

2

Page 3: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

Signal Timing Practice3

Turning movement counts (15-30% total cost)

Computer model and timing optimization (50~70%)

Field implementation and fine tune (10~20%)

Timing maintenance (<5%)

Page 4: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

Coordination parameters4

Cycle length

Phase sequence

Phase split

Phase offset

Page 5: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity 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

Page 6: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

6

Page 7: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

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Inte

rsec

tion

an

d d

ista

nce

NB

Page 8: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

Real-world Issues8

Variable speeds

Early releases

Wrong offset reference Start or end of coordinated phases TS2-1st Green or First Ring

Signal out of coordination Preemption Pedestrian Loss communication

Clock time

Page 9: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

9

Cycle = 120

Page 10: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

10

NB

Page 11: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

Before-After12

After BeforeTotal = 4’04” Total = 6’15”

Page 12: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

Before-After13

After BeforeTotal = 4’04” Total = 6’15”

Page 13: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

SMRTSignal Monitoring & Retiming Tool

14

Page 14: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

15

Page 15: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

16

GPS

Page 16: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

SMRT17

Page 17: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

SMRT18

Page 18: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

SMRT19

Page 19: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

CONCLUSIONS20

Signal timing can be done without traffic counts (15%+ saving)

Significant improvement by simply changing phasing sequences15% travel time saving20~80% saving in stops

My magic “Timer”

Page 20: SIGNAL TIMING WITHOUT TRAFFIC COUNTS

Transportation Research GroupUniversity of Nevada, Reno 2012 ITE District 6 Annual Meeting

?21


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