pages: TransportationCommission/2021-01-27.pdf, 6
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TransportationCommission | 2021-01-27 | 6 | community complaints. And, how much more property damage occurs at intersections with roundabouts, due to cars hitting houses/property, as they round the turn at high speeds. Ms. Ferguson responded that there is no data on the number of communities that have put in and then removed roundabouts. Conversations with the public are important, and a thoughtful process on where, and how they are designed is essential. As for property damage, the data shows that rear-end crashes, which are lower severity, are the most common at all roundabouts, and also side swipes, at multiple lane roundabouts. With signage and the right geometry, they do not see overly aggressive and fast driving through intersections. It is just not feasible. Denyse Trepanier, Bike Walk Alameda Board member, appreciates staff bringing this item up. She strongly encourages everyone to view the NHTSA website, which has great case studies and some write ups from conservative places, where roundabouts have been installed with opposition and then later were embraced by the community. In the Bay Area, there are mini-roundabouts implemented inconsistently, which makes it difficult for the community. In Berkeley, some have no stops, others have two-way stops and others have four-way stops. It is unclear how to use them. She hopes that Alameda will have consistency with their implementation and that stop signs would be pulled out where mini-roundabouts are installed. Combining the two devices is confusing. Steven Jones appreciates the education from the consultants. A roundabout at Central/Encinal/Sherman makes sense since there have been bad accidents there, which he knows as a past Fire Department employee. At Island/Mecartney, however, conflicts are extremely low. If it ain't broke then don't fix it. Chair Soules, based on the Zoom chat, asked for staff to respond to a question about roundabouts and stop signs. Ms. Ferguson stated that stop signs should not be used at roundabouts. Either stops signs or roundabouts are installed, not both. Mr. Alston stated that there are many types of circular intersections. In Berkeley and Oakland, these are not modern roundabouts. Michelle Wan, via the Zoom chat, asked three questions: (1) In the presentation, there was a slide for Safety Performance. I would like a clarification on what is the set up that is compared to, and whether the set up is similar to the spots (including Bay Farm) that we are considering putting roundabouts. Ms. Ferguson stated that statistics are from studies of roundabouts from the United States. They compared intersections that were converted from signalized to roundabouts at intersections, and looked at before and after data, usually with 3-5 years of data for both. There were many locations and they were urban or suburban. Michelle Wan asked what the cons are of roundabouts. Transportation Commission Meeting Minutes - January 27, 2021 6 | TransportationCommission/2021-01-27.pdf |