This Wednesday evening, the city Transportation Commission will hear a presentation from staff and consultants to address ongoing safety issues at Lincoln Ave. and Walnut St.

Like a sleeper wave, that intersection appears placid — until it's not:

In response, city staff restriped the lanes leading to the intersection in 2020 and in 2023 city staff presented "immediate safety improvements at Walnut Street" to City Council. But unfortunately the latter set of changes were neither immediate (they were completed in early 2025, due to contractor delays) nor were they apparently sufficient as safety improvements.

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A note on city staff's authority: The Public Works Department and City Engineer have delegated authority under AMC Section VIII to stripe the city's streets following adopted city-wide policy and their professional judgement. That's likely why staff performed the 2020 restriping around Lincoln/Walnut without direct Council involvement (to my knowledge).

However, contracts of a certain size are always submitted to Council for approval, often under the consent calendar — that's likely why the 2023 set of quick build improvements appeared on the Council consent calendar.

For this evening's TC meeting, the staff report describes a dangerous pattern at that intersection that is ongoing: broadside crashes, in which one driver darts across the intersection and is pegged by another oncoming driver.

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At the nearby intersection of Lincoln/Oak, a couple months ago I witnessed an auto-on-auto crash during the middle of a weekday morning. The at-fault driver paused and then drove off. (Yes, a driver crashed into another vehicle and then fled the scene immediately in front of the Alameda Police Department headquarters.)

I waited around with the dazed but unhurt driver and an Alameda Free Library staffer until we could all give our statements to an APD officer. A few weeks later I got a phone call from an insurer and was asked to give a recorded audio statement as part of their investigation.

Traffic safety improvements do consume public funding, but they benefit all of us by reducing costs we may be asked to assume in the flash of a moment. For the worst crashes, it's saving lives, pain, and medical expenses. For these more mundane crashes, better designed streets reduce the odds of all that hassle for the impacted driver, the library staffer, the APD officer, however many insurance staffers, and myself who all had to put in our time to just make sure that the driver who was not at fault could have the front side of his car replaced by his insurance policy.

To reduce future odds of more vehicle-on-vehicle broadside crashes, staff and consultants are proposing to implement a "diverter island" at this intersection:

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While diverter island may be the technical term (since the addition will divert auto traffic on Walnut Street) when I see this, I think: fidget spinner.

My kids have recently been creating doohickeys with the 3D printer we gave them for Hanukkah, so that's what pops into my head when looking at this shape.

As professional engineers always do, this draft street design has been measured against "design vehicles" — including a fire truck. The staff report further discusses how this plan is inline with overall fire response routes:

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The staff report also mentions that staff evaluated this intersection against stop sign warrants (which this blog recently described as "one of the most sacred of American traffic-engineering professional practices") and determined a four-way stop would not be appropriate.

While I'll save any actual substantive questions and comments about these plans for the TC meeting, let me share in advance that these changes are hardly unprecedented. The City has a history of closing this intersection to certain vehicular movements to reduce points of conflict and to increase safety. Here's the view this past 4th of July when I biked through the parade staging area on my e-cargo bike with my kids (so my daughter could get to the Girls Inc. parade contingent):

As always, the Transportation Commission is open for public comment in person, via Zoom, or sent in advance by email.

A "fidget spinner" to improve the small but dangerous intersection of Lincoln Ave and Walnut St