Agenda - Council - 10/26/2021 - Laserfiche WebLink

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-Mr. Bruce Westby, PE December 16, 2016 Page 2 turn phasing (left turns allowed on green aiTow only) for all intersection approaches. In order to provide more efficient operations for these left turning movements (especially during non -peak traffic periods), the City is interested in considering modifications to this signal system to incorporate flashing yellow arrow operations on a time of day basis. The implementation of flashing yellow arrow operations generally allows for greater flexibility in how the left turn movements are operated throughout the day. In order to analyze the potential for utilizing flashing yellow arrow operations, the City has requested that a qualified signal design consultant complete a comprehensive review of the signal system. This will help to determine if the signal system and corresponding left turn movements should be retrofitted with flashing yellow arrow operations or if the signal system should not be modified due to operational, geometric, or safety concerns (such as sight distance issues, crash history, intersection geometrics, etc.). Items recommended to be considered in this analysis include: • Review of intersection signal components (controller and cabinet equipment, signal head placement, vehicular detection, etc.) to determine what components will require upgrading to allow for flashing yellow arrow operations. • Review of intersection geometrics to determine if there are conditions (such as dual left turn movements at highly traveled intersections, sight distance concerns, lack of dedicated left turn lanes, etc.) that might preclude the upgrading to flashing yellow arrow operations. • Review of recent crash history at this intersection to determine if there are right angle crash histories that may preclude changes to the operation of the signal system. • Review of recent traffic approach volumes to determine limitations of flashing yellow arrow operations and time of day operations. SEH has previously completed analysis of flashing yellow arrow operations at several locations and has provided agencies such as the Anoka County Highway Department with a detailed memorandum listing criteria for consideration of flashing yellow arrow operations. These criteria are based on current State standards and guidelines along with consideration of specific intersection issues. SEH will provide the City of Ramsey with analysis and review services needed for the City to be able to consider budgeting and scheduling for future flashing yellow arrow upgrades to this signal system. The City and County will be included in the ongoing analysis to ensure that the City and County are in agreement with this analysis and are able to provide input into proposed future budgeting and implementation recommendations. Scope of Work Field Review of Intersection Using existing signal plans to be provided by the City or County, SEH will perform a brief site visit of this signal system to determine existing signal components, controller and cabinet capabilities, requirements for signal construction work needed to upgrade each left turn movement to FYA operations, and overall limitations on being able to implement FYA operations for any applicable intersection movement.