Purple dots phase II.
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Purple dots phase II.

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  • Alternative Title:
    Maryland Transportation Authority experimental traffic control device testing at Maryland toll plazas : FHWA experimentation #3-181 (ex)-purple dot markings for E-ZPass® lanes, June, 2012
  • Corporate Creators:
    Kittelson & Associates, Inc
  • Contributors:
    Mukai, Roxane Y.
  • Subject/TRT Terms:
  • Publication/ Report Number:
    Project No. 8157.5
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Maryland
  • Corporate Publisher:
    Maryland Transportation Authority
  • Abstract:
    On behalf of the Maryland Transportation Authority (MDTA), Kittelson & Associates, Inc.

    (KAI) is conducting an evaluation of an experimental traffic control device at a Maryland toll

    plaza. This report summarizes our findings for the evaluation of the purple dot pavement

    marking treatment. The purple dots were installed on the northbound Fort McHenry Toll

    Plaza approach in Baltimore, Maryland in June 2011. They were installed for three dedicated

    E-ZPass® lanes (Lanes 3, 6, and 10) as shown in Figure 4 in the main section of this report.

    The goal of applying the purple dots is to improve toll plaza operations and safety between

    the tunnel mouth and toll plaza by reducing conflicts created by lane changes and weaving

    just prior to the plaza. Additionally, the purple dots are intended to improve wayfinding for

    E-ZPass® customers

    This is the second time purple dots have been installed on the northbound Fort McHenry

    Toll Plaza approach. Under the Phase I experiment, purple dots were installed in November

    2005, and removed several years later when a portion of the toll plaza was rebuilt and the

    roadway was resurfaced. The results of the Phase I experiment are documented in an MDTA

    Report prepared by KAI dated May 11, 2007 (Ref. 1). In Phase I, the purple dots were generally

    found to reduce lane changing and increase utilization of the E-ZPass®ONLY lanes on

    the right side of the toll plaza.

    This report provides the results of the current, Phase II experiment, as well as analysis of

    Phase I crash data not available at the time the Phase I report was prepared. The Phase II

    experiment was conducted in response to the Federal Highway Administration’s (FHWA)

    comments on the Phase I experiment. At this time, the Phase II purple dots remain in place

    at the Fort McHenry Toll Plaza. FHWA granted approval for experimental use of the dots

    through July 1, 2012.

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