DATE: February 22, 2018
TO: Board of Mayor and Aldermen
FROM: Eric Stuckey, City Administrator
Paul Holzen, City Engineer/Director of Engineering
Jonathan Marston, Assistant Director of Engineering
SUBJECT:
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Presentation of Proposed Pavement Marking Plan for Hillsboro Road
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Purpose
The purpose of this memo is to provide information to the Franklin Board of Mayor and Aldermen (BOMA) concerning the final pavement markings for the Hillsboro Road Phase 2 Improvements Project.
Background
The limits of the Hillsboro Road Phase 2 Improvements Project extend from Independence Square to approximately 600 feet north of Claude Yates Drive. The original design included a 3-lane typical section (e.g. 1 thru lane in each direction and a center two-way left-turn lane) with additional, dedicated right-turn lanes as needed. More specifically, dedicated right turn lanes were proposed at Joel Cheek Boulevard, the main entrance to Franklin High School, and at Claude Yates Drive. This original configuration is shown on Exhibit A.
During construction, staff recognized that the Hillsboro Road Phase 2 plans and the Mack Hatcher Parkway Northwest (NW) Extension plans overlapped north of Claude Yates Drive. More importantly, the design of the overlap section did not match between the plan sets. Therefore, staff requested and was given direction to construct, from Claude Yates Drive to the northern project limits, the Hillsboro Road typical section as shown in the Mack Hatcher Parkway NW Extension. This decision will result in savings to the taxpayers and less future disturbance to several property owners along Hillsboro Road during the construction of the Mack Hatcher NW Extension.
Toward the end of 2017, as the roadway was starting to take its final shape, staff began reviewing the proposed pavement marking plan for Hillsboro Road. With the typical section change north of Claude Yates Drive, crews were able to mark an additional northbound thru lane. This led staff to look more critically at the pavement marking design for the entire Hillsboro Road Phase 2 Improvements project. While the original intent of the design was to construct a 3-lane section with additional, dedicated right-turn lanes, it is important to understand that these additional right-turn lanes required the construction of a roadway typical section that can support 4-lanes of traffic. The original design simply utilized pavement markings to render the “left over” pavement areas unusable by traffic.
Because of the typical section modification north of Claude Yates Drive, which resulted in an added northbound thru lane, staff recommends a reconfiguration of the multiple, dedicated right-turn lanes to a second northbound thru. This outside northbound thru lane will add additional capacity to the roadway, while requiring no structural modification to the roadway and adding no additional delay.
Financial Impact
This change results in no financial impact, as the roadway is still awaiting its final asphalt surface and final pavement markings.
Recommendation
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Staff recommends proceeding with the revised pavement marking plan, which reconfigures the multiple, dedicated right-turn lanes into a second northbound thru lane, as shown on Exhibit B.