ITE Journal - August 2020 - 39

LeadershipITE Reimagined

At first glance it is evident the Yield sign plaque reading "Do
Not Merge" was more effective than the one reading "To Both
Lanes" and that both were better than no message at all. McNemar's
Test was used to compare the two countermeasures with each other,
and individually with no countermeasure ("None"). This follows
from Hanscom.5, 6 The test was done by comparing the proportion
of participants who correctly understand the meaning of one
treatment (Treatment A) but not the other (Treatment B), and
vice-versa. Participants who understood both A and B correctly, or
neither, did not count since the outcome was no distinction between
treatments. Having established the proportion of each a z-test was
then applied to determine the statistical significance.
The greatest observed statistical difference in correct responses
was between "None" and the "Do Not Merge" plaque. Both the "Do
Not Merge" and "Yield to Both Lanes" plaques produced z-test scores
with less than 5 percent level of significance, meaning there was less
than a 5 percent chance of no difference between them and "None."
Thus, the clear implication is that either plaque is better than none.

Conclusions and Recommendations
The sign effectiveness testing indicated that installing Yield sign
plaques that read "Do Not Merge" might help lessen the merge-type
conflict at multilane roundabouts. "Yield to Both Lanes," although
statistically better than nothing, seemed to be a less effective message.
It would also need to be modified for roundabouts having more than
two circulating lanes. Repeated sets of lane use signs and arrows were
not specifically tested but should help address the left-turn conflict.
The merge-type conflict should also lend itself to being mitigated
by not installing, or removing, the circulatory road lane lines at most
multilane roundabouts. Unless there are double left turns or exclusive
movements, lane lines on the entries and exits should be sufficient and
a roundabout should not need circulatory road lane lines.
Reducing the number of lanes in a roundabout is undoubtedly
the most effective "countermeasure" of all. Where possible, it is
recommended that a partial two-lane roundabout be installed
instead of one where all entries and exits are two or more lanes
(i.e. a 2x1 instead of a 2x2 roundabout), or a lane configuration be
introduced that has single-lane exits.
Education and enforcement are needed as well. Both should
include making sure police officers are aware of which driver is at
fault when a collision occurs, and making sure driving instructors
and manuals are providing correct information.
Multilane roundabouts have tremendous safety potential. Unlike
single-lane roundabouts, they can be used at high-volume locations
and as a replacement for large signalized intersections where high
numbers of crashes occur. It is hoped that at least some of the countermeasures presented in this article are reasonable and implementable,
and can be used to further the implementation of this important
intersection safety treatment in the United States and Canada. itej

e are bringing LeadershipITE to you! For 2021, LeadershipITE
will be a 100-percent virtual experience, providing
participants not only the same content that this program is
built on, but also enhancements to provide additional ways
to engage with classmates, alumni, and the greater ITE community.
LeadershipITE has always been built on the diversity of our
profession, with our team looking to build classes each year that
highlight this. We are excited to be able to provide a program that
can even be more inclusive by stripping away the time and cost
constraints of travel.
With the 2021 program, you will be able to get the same powerful
LeadershipITE experience in a format that helps to better support and
balance your professional and personal lifestyle.
Don't look at this virtual experience as a series of webinars-it
couldn't be more opposite. The curriculum is built around engagement
and each virtual workshop will include interactive and experiential
elements. You will have even more opportunities to meet new people
and grow your networks, with engaging social events, sessions, and
assignments with various LeadershipITE alumni and ITE leadership.
If you've been interested in LeadershipITE, and the travel schedule
and costs have held you back, 2021 is your opportunity to experience
this one-of-a-kind interactive and engaging program without having to
sacrifice time away from your family and work responsibilities.

Check out this video to learn more about LeadershipITE 2021:
https://youtu.be/0QR3YlFbKQM

To stay up-to-date on the latest LeadershipITE activities
send a note to leadership@ite.org.
For more information and to apply to LeadershipITE,
visit https://www.ite.org/professional-andcareer-development/leadershipite/.

Application deadline for the
class of 2021 is September 16, 2020.
w w w .i t e.or g

Augu st 2020

https://www.youtu.be/0QR3YlFbKQM https://www.ite.org/professional-and-career-development/leadershipite/ https://www.ite.org/professional-and-career-development/leadershipite/ http://www.ite.org

ITE Journal - August 2020

Table of Contents for the Digital Edition of ITE Journal - August 2020