ITE Journal – December 2019 - 38

The use of flashing yellow arrows is becoming more prevalent
in common practice in the United States because of the operational
benefits. Even though flashing yellow arrows are considered as
equally understood as a green ball, it is generally accepted that
flashing yellows can be safer than the traditional yield-on-green
indications, which can reduce crashes up to 24 percent.2,3
Traditionally, most government agencies don't allow for the
use of protected/permitted operation at signalized dual left turn
lanes, because of the safety implications. With more government
agencies using flashing yellow arrows, there are changes in
policies to allow for protected/permitted operations for dual left
turn left turn movements, but is rarely implemented. There are
some government agencies developing guidelines or criteria for
the time of day use of the flashing yellow arrow by predicting
the risk of left turn crash occurrences throughout the day.4 Some
government agencies will procure an advanced traffic signal
control technology through the Federal Highway Administration systems engineering analysis.5 However, these technologies
are expensive due to high infrastructure cost and procurement
of the technology.

Adding Flashing Yellow Arrows to Mainline Dual Left Turns
For this study, the Wisconsin Department of Transportation
(WisDOT) arranged to have the traffic signal faces for the
northbound and southbound left turn directions retrofitted from
a 3-section protected only operation to a 4-section flashing yellow
arrow operation at State Trunk Highway (STH) 67 and County
Highway (CTH) B (Valley Road), in which both left turns have dual
left turn lanes. Figure 1 shows the WisDOT traffic signal plan for
STH 67 and CTH B (Valley Road). The intersection was chosen
because of the following characteristics:
ƒ Intersection geometric reconstruction to modern safety
standards (including neutral left turn offset);
ƒ Traffic signal reconstruction (updating to a safer head per lane
configuration);
ƒ Minimal horizontal curvature;
ƒ Minimal signal infrastructure revision cost, which include
(other than controller programming):
ƒ New brackets and signal faces (both procurement and
in-field modifications); and
ƒ Signal video detection (in-field modifications only).

Figure 1. WisDOT Traffic signal plan for STH 67 and CTH B (Valley Road).
38

D ecem ber 2019

i t e jo u rn al



ITE Journal – December 2019

Table of Contents for the Digital Edition of ITE Journal – December 2019

President’s Message
Director’s Message
People in the Profession
ITE News
10th Annual ITE Collegiate Traffic Bowl Grand Championship Tournament Recap
Board Committee: Women of ITE: Allies in Design and in the Workplace
Member to Member: Ariel Farnsworth (M)
Calendar
Where in the World?
Industry News
ITE 2019 Year in Review
Impacts of Red-Light Cameras on Intersection Safety: A Bayesian Hierarchical Spatial Model
Dynamic Flashing Yellow Arrow Operations
Advisory Bike Lanes and Shoulders: Current Status and Future Possibilities
Professional Services Directory
ITE Journal – December 2019 - 1
ITE Journal – December 2019 - 2
ITE Journal – December 2019 - 3
ITE Journal – December 2019 - President’s Message
ITE Journal – December 2019 - 5
ITE Journal – December 2019 - Director’s Message
ITE Journal – December 2019 - 7
ITE Journal – December 2019 - People in the Profession
ITE Journal – December 2019 - ITE News
ITE Journal – December 2019 - 10
ITE Journal – December 2019 - 11
ITE Journal – December 2019 - 12
ITE Journal – December 2019 - 13
ITE Journal – December 2019 - 10th Annual ITE Collegiate Traffic Bowl Grand Championship Tournament Recap
ITE Journal – December 2019 - 15
ITE Journal – December 2019 - 16
ITE Journal – December 2019 - Board Committee: Women of ITE: Allies in Design and in the Workplace
ITE Journal – December 2019 - 18
ITE Journal – December 2019 - 19
ITE Journal – December 2019 - Member to Member: Ariel Farnsworth (M)
ITE Journal – December 2019 - Where in the World?
ITE Journal – December 2019 - Industry News
ITE Journal – December 2019 - ITE 2019 Year in Review
ITE Journal – December 2019 - 24
ITE Journal – December 2019 - 25
ITE Journal – December 2019 - 26
ITE Journal – December 2019 - 27
ITE Journal – December 2019 - 28
ITE Journal – December 2019 - Impacts of Red-Light Cameras on Intersection Safety: A Bayesian Hierarchical Spatial Model
ITE Journal – December 2019 - 30
ITE Journal – December 2019 - 31
ITE Journal – December 2019 - 32
ITE Journal – December 2019 - 33
ITE Journal – December 2019 - 34
ITE Journal – December 2019 - 35
ITE Journal – December 2019 - 36
ITE Journal – December 2019 - Dynamic Flashing Yellow Arrow Operations
ITE Journal – December 2019 - 38
ITE Journal – December 2019 - 39
ITE Journal – December 2019 - 40
ITE Journal – December 2019 - 41
ITE Journal – December 2019 - 42
ITE Journal – December 2019 - 43
ITE Journal – December 2019 - Advisory Bike Lanes and Shoulders: Current Status and Future Possibilities
ITE Journal – December 2019 - 45
ITE Journal – December 2019 - 46
ITE Journal – December 2019 - 47
ITE Journal – December 2019 - 48
ITE Journal – December 2019 - 49
ITE Journal – December 2019 - Professional Services Directory
ITE Journal – December 2019 - 51
ITE Journal – December 2019 - 52
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