United States Department of Transportation
i
Experimental traffic control device testing at New Hampshire toll plazas.
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2007-06-01
[PDF-15.61 MB]
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Alternative Title:Experimental traffic control device testing at New Hampshire toll plazas : purple lights for E-Z pass wayfindings.
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Edition:Final report.
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Abstract:This report includes a description of the testing and evaluation methodology of the “E-ZPassSM Purple Light Experiment.” Purple lights with
advanced signs were installed as supplemental traffic control devices for northbound and southbound E-ZpassSM movements along the I-93
approaches to the Hooksett Toll Plaza (north and south Toll Lanes #4 and #5). The purpose of the purple lights was to improve toll plaza
operations and safety through the reduction in the number of conflicts created by last minute lane changes at the toll booths and weaving
maneuvers that take place between the approach lanes and the toll booths. The Hooksett test site was selected because of the unique
characteristics of the horizontal and vertical geometrics that connect to the toll plaza from the north and south. In addition, this site is prone
to early morning fog, a condition that may be susceptible to improved traffic operations given these wayfinding lights.
The purple light experiment was conducted and evaluated under a scope of work derived from a similar experiment using “p urple dots” as
wayfinding devices conducted in the fall of 2005 by Kittelson and Associates, Inc. for the Maryland Transportation Authority (MTA). The
traffic operational analyses and the presentation of results in this report were prepared for consistency in cross comparison with results
from the MTA’s purple dot experiment. Two distinctly different procedures were used in evaluating the effectiveness of the purple lights;
field data evaluated by several measures of effectiveness (MOE’s) and a customer survey.
The statistical analyses of the four MOE’s and customer survey revealed changed driver behavior in several respects, during a four-week
period in October 2006. The report includes a number of potential modifications for further testing.
An Appendix containing data collected during this study is available from the NHDOT upon request.
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