pages: TransportationCommission/2021-01-27.pdf, 4
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TransportationCommission | 2021-01-27 | 4 | Staff Payne responded that these are not modern roundabouts, and that staff would have to look up what data we have. Commissioner Kohlstrand asked if the City would use traffic circles to meet some traffic management needs, where there is less space for a full roundabout. Ms. Ferguson said that mini-roundabouts are another option when right-of-way is constrained, particularly to remove two- or four-way stops. The key is that there needs to be enough space to manage vehicle speeds and the direction of travel. Mini-roundabouts still use central islands and splitter islands, but they are traversable by larger vehicles. Chair Soules asked staff to clarify the process on determining the locations for roundabouts, and the language in the slides. The City should not be trying to find out where they could work. This is just one possible option for intersections, part of the tool box. She would like staff to solve issues, rather than just respond and analyze the community's specific request for a specific device, like a stop sign. Staff Payne clarified that this roundabout effort is part of City's Vision Zero effort. This analysis with Kittelson is being used to determine the top five intersections for roundabouts in the City, based on safety, looking at the High Injury Network. Chair Soules encouraged community involvement in these types of decisions with new treatments. Public Comments for #6B Michael Robles-Wong stated that they learned to use roundabouts in the United Kingdom, and knows they are safer, especially for very wide intersections. His primary concern is for pedestrians and children. They notice that the crosswalks are further from each other. They encouraged the City to talk to the Police Department, since they pay the crossing guards. They wondered if the Island/Mecartney intersection would need four crossing guards, instead of the one or two it has now if a roundabout were installed due to the spacing of the crosswalks and the lack of visibility between them. Thank you for the great informational presentation. William Pai, Board President of Harbor Bay Isle, sees advantages of roundabouts. He is curious about the Island/Mecartney intersection and if it were to be done how long would it take to implement. He has concerns about the construction period. Staff Amiri, City Traffic Engineer, clarified that Public Works hired a consultant in 2019 to perform an Intersection Control Evaluation, which compared three options (existing, traffic signal and roundabout), and recommended a roundabout as the best for traffic control. She offered to present it at a future meeting. A typical construction period could be as long as a year. Chair Soules asked staff to explore the construction period needed, and the neighborhood disruption, and bring to future meeting. Transportation Commission Meeting Minutes - January 27, 2021 4 | TransportationCommission/2021-01-27.pdf |