SIGNAL TIMING WITHOUT TRAFFIC COUNTS

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

Zong Z. Tian, Ph.D., P.E.University of Nevada, Reno

http://unr.edu/homepage/zongt/

Presented by

Jim Poston

Regional Transportation Commission of Washoe

County

Overview

Signal timing practice

Case study My magic tool

Results

Conclusions

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%)

Coordination parameters4

Cycle length

Phase sequence

Phase split

Phase offset

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

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

Cycle = 120

Before-After12

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

Before-After13

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

SMRTSignal Monitoring & Retiming Tool

SMRT17

SMRT18

SMRT19

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”

SIGNAL TIMING WITHOUT TRAFFIC COUNTS

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Transcript of SIGNAL TIMING WITHOUT TRAFFIC COUNTS

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.

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