pages: TransportationCommission/2021-07-28.pdf, 4
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TransportationCommission | 2021-07-28 | 4 | Mr. Alston discussed the difference between modern roundabouts and traffic circles. He went into the details and the geometric space needed for each to work. He said the main difference with traffic circles is that they are more appropriate for low volume, local streets. Commissioner Kohlstrand discussed her experiences with traffic circles. She felt that they would not have that kind of space in Alameda but that should not keep them from improving safety. She asked if a smaller version could work in those higher volume intersections that have 25 mph speed limits. Mr. Alston discussed the emerging trend of using mini-roundabouts. He explained how they address the space constraint issue, the center aisle is completely traversable and can work in spaces with low-speed limits. He did add that they are usually used in places that have an established history of roundabouts, so people know how they work. Staff Member Payne clarified that the 85 percentile speed was more like 32-35 mph, which was much higher than the actual speed limit. Commissioner Weitze wanted to know what was the typical minimum/maximum for a traffic circle or a mini-roundabout. Mr. Alston explained the physical attributes that mark the difference between traffic circles and roundabouts. Chair Soules said she appreciated the criteria to apply some sort of guidance for future funding. She encouraged the staff to focus on education and outreach to help people understand. Staff Payne confirmed that the commission wanted them to continue this research and work on the remaining arterials and collectors in town. Chair Nachtigall very much wanted them to continue this work. She agreed with Commissioner Kohlstrand about being able to implement them in other ways. She had an appetite for exploring intersections where any sort of circular intersection could work. Rochelle Wheeler, Senior Transportation Coordinator, discussed the work she had been doing with the Slow Streets Program and how temporary traffic circles had been discussed. The idea was to test out some of these on the streets of Alameda. TC Meeting Minutes 4 July 28, 2021 | TransportationCommission/2021-07-28.pdf |