Urbanist Twitter on Northfield’s Roundabout

Last week, the Strib tweeted a story about Northfield’s planned roundabout with tunnels for people walking and biking:

Urbanist Twitter responds

One local urbanist (streets.mn founder, active with Strong Towns, Planning Commissioner, and good guy) tweets:

Famous walkability guy Jeff Speck chimes in:

The exchange ended here:

I’m not sure exactly how Jeff Speck is defining the “solution” but my sense of many projects and places is that success is relative, not absolute. So my personal experience includes good and pretty awful bike/walk tunnels (none next to a roundabout) and better and worse roundabouts.  For the Northfield project, I’m thinking in terms of an acceptable solution which addresses some of the issues facing Northfield. Another way, the project is expensive and imperfect, but justifiable.

Strib is wrong!

The Strib corrected their story to show the the approved design below, rather than the rejected design in the tweets above which brought all the pedestrian tunnels to the center at a sort of below-grade plaza shown in the tweets above. The adopted version is simpler and allows more direct travel by people riding, rolling and walking:

Screen Shot 2019 11 04 At 6.00.00 Am

Twitter is right!

The proposed roundabout plus tunnels is a huge amount of infrastructure with a very high price tag for an intersection with only 4,000 AADT. MnDOT and the City chose the roundabout design early and cut off opportunities to rethink the intersection for people walking, rolling, and riding and for cost savings in the short and long term.

I especially agree with Jeff Speck that while roundabouts are the safest and most pedestrian friendly of the car-centric designs, they are still completely auto-centric infrastructure. So, yeah, the Northfield roundabout is a mega-project which violates urbanism best practices and squanders an opportunity to shift away from the suburban, car-focused paradigm.

 

But not completely right

This intersection is a big dangerous problem for Northfield because of prior planning problems, the character of the roads involved, Northfield’s nascent understanding of walkability and how to achieve it, and the political climate of the city.

An earlier exchange with many of the same complaints was kicked off by the only other person in the conversation who knows the Northfield landscape and, as a result, can also see the upside:

Northfield is just beginning to walk back the decades of suburban development which reached its apotheosis with the Northfield Middle School.  The proposed roundabout just north of the Middle School and smack dab in the middle of this unconnected, residential area with three of Northfield’s five schools, a community center (including a senior center), and a future state trail which will be a major east-west bike/walk connection. And the north-south road is a state highway, just to add some jurisdictional complexity and design constraints.

Middle School Traffic

All the ways Northfield disconnected the City

 

No other routes to school

Because there are NO other contiguous streets which connect the Middle School and there are two more schools plus the coming into town get-to-work traffic, congestion at this intersection is highly concentrated into “rush minutes” keyed to the school day. School start and end vehicle traffic jam times are the very same times kids might be walking and biking to school (All detailed here).

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AADT map of Northfield

 

Perceived safety

Here’s what traffic looks like now as it heads to the 4-way stop with turn lanes during the school rush. There are multi-use paths and sidewalks leading to this intersection, but crossing the multi-lane all way stop in traffic like this is daunting and dangerous – both actually dangerous (with one person killed crossing on foot and multiple crashes) and certainly subjectively dangerous.

246 Solutions Photo Of Congestion 1024x576

Middle School traffic (Image: 246 Solutions)

 

Parents are rightly afraid to let their kids bike or walk through this area now, but also expressed concern that kids crossing this kind of traffic at grade at a roundabout doesn’t feel safe. Slowing cars and crossing at grade is the urbanist recommendation, but in this mostly suburban area, there is a strong belief safety is achieved only by making sure people walking and biking are physically separated from heavy traffic. 

Older adults and people with mobility or vision challenges are also uncomfortable with crossing traffic lanes and needing to perch on “refuge medians” (surely the word “refuge” suggests being stranded) especially if crosswalks are before vehicles enter the roundabout and traffic is slowing down from 45 or 50 mph and looking left for other vehicles rather than for unprotected people.

The Mill Towns State Trail will also pass through this intersection along Jefferson Parkway. While many riders and walkers on this leg will be able to cross at times which are not during the concentrated school times, the DNR recommendation for trails crossing roadways with these speeds would be a grade separated crossing which, again, is typically perceived as safer and easier for recreational users.

The implied demotion of people walking and biking by forcing them under the cars has not entered Northfield’s discussion; rather giving walkers and riders their very own space is seen as increasing the importance of active transportation. A small bonus for both perspectives: the intersection is already somewhat elevated, so underpass grades will be quite flat rather than descending sharply.

It’s a state highway

The current 4-way stop doesn’t work well for any mode of travel, but when choosing another intersection control the City was limited by MnDOT requirements for its highway. The intersection does not meet MnDOT warrants for a traffic signal (traffic projections forecast warrants would be met by 2040) for one thing, and MnDOT’s emphasis on traffic flow and Level of Service prioritized easy driving…so, a roundabout was the choice. There is discussion of turning back this route to the county and/or city, but that possible future development will come too late for this project.

The highway has a posted speed limit of 45 mph in front of the middle school as vehicles slow down from the 55 (or maybe 60 as speed limits were raised recently) out of town section:

Speed Limits

Speed limits on Highway 246

Building schools on state highways is a bad idea, but Northfield did it anyway.  Three times. So, the school district buses kids across the street to the Middle School because it is a hazardous crossing and the traffic accelerates out of town right about at the Middle School. Slowing traffic should happen well south of the roundabout and maybe, if this becomes a county of city route, there will be more opportunity to do that. But, again, too late for this project.

Back to the roundabout

Given the facts of this intersection, what should Northfield do right now to improve safety (actual and perceived), fix school traffic jams and encourage small people, older people and recreational trail users to walk and bike through this intersection?

Note the Catch-22: If Northfield could increase the number of students getting to school under their own power that would reduce rush minute congestion created by adults chauffeuring kids to school…and if it reduced demand during peak times then the over-engineered roundabout would not be needed. But how could Northfield increase walking and biking through an intersection where people die?

My position is the roundabout can relieve the traffic jams (and improve air quality by eliminating those idling cars and buses), reduce the number of conflict points for car crashes (of which there are many), and adding tunnels makes the walking and biking not only statistically safe, but safe feeling. Making biking and walking feel safe opens the door to schools encouraging kids to walk and bike (and parents will allow it), gives the Mill Towns Trail an enhanced chance of success by allowing low stress, non-stop travel (just like the cars want!).

Mill Towns Trail Jefferson Alignment 785x1024

Mill Towns Trail route through Northfield

Will it work?

I’m betting that IF the City ensures that there are safe bike and walk routes to the roundabout from all directions (for thinking beyond the project area is always a challenge), then Northfield opens the door to biking and walking as real transportation so that by the time this needs to be reconstructed, the landscape will be different and the next solution will be climate focused instead.

But. I also have deep reservations about this approach. Adding bike and walk facilities, even really good ones, to a system designed for and prioritizing vehicle travel – as this project most certainly does – only reinforces the unsustainable design mentality which supports the “drive everywhere” status quo. Right now, this project will be a big improvement which is politically possible, but it does nothing to address the critical issue of reducing driving to save the planet and our health.

I have two hopes for this project beyond getting people riding, rolling and walking safely to all the important destinations near this intersection. First, this project will be an object lesson in Northfield’s evolving climate action planning highlighting about what not to do in the future. Second, the City and school district will understand this project is a very expensive bandaid to fix a series of land use and transportation mistakes which both jurisdictions will want to endeavor not to repeat. Maybe the very high price tag will focus their attention more sharply.

A quick look at a map of the City shows the wonderful, walkable core, but then how the City sprawled and spread. Northfield did a very thorough job of not merely breaking, but flouting Jeff Speck’s walkability rules and we’re just starting to put the town back together. The particular challenges at this critical intersection mean I’m defending the choice to separate the bike and walk trails and route them under the vehicle traffic to help people feel safer and accepting the car-centricity of a roundabout while we work on all the other many pieces. After so completely cutting off connectivity in the past, Northfield’s decision to try a big fix at this intersection is defensible, but disappointing.  

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Northfield Middle School: Thinking how to make biking easier (Image: Griff Wigley)

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7 Responses to Urbanist Twitter on Northfield’s Roundabout

  1. Bill Lindeke
    Bill Lindeke November 21, 2019 at 9:34 am #

    Thanks Betsey. Love to see the speed limit go UP at the school, rather than the reverse.

  2. Adam Miller
    Adam Miller November 21, 2019 at 10:15 am #

    Who is the complete idiot who decided that the speed limit should go up right next to the schools??

    And yeah, the basic point is that this area is not urban.

  3. James A Schoettler November 21, 2019 at 1:09 pm #

    Why not have a bike roundabout above the auto roundabout?

    • Brian November 21, 2019 at 7:11 pm #

      I thought the general consensus on raising bicycles and pedestrians above vehicle traffic is that neither group likes raised overpasses to cross roads?

      • James Schoettler November 24, 2019 at 7:46 pm #

        These things always depend on design. In Europe I have seen a number of bicycle bridges that are effective because the elevation difference is shared between the vehicles and bicycles, instead of making the bicycles do all the climbing. Also, they have long enough ramps that it is hardly noticeable. Seems to me a bicycle circle above a traffic circle would be more efficient in terms of structure, real estate and travel distance for the bicycles.

  4. Monte Castleman November 21, 2019 at 6:10 pm #

    Ideology like how this wonderful design for all users doesn’t punish people in cars enough is part of why there’s such a backlash against improving pedestrian infrastructure in the suburbs.

    As a motorist, if you try to punish people in cars by needlessly making them slow down for a pedestrian crossing rather than having a grade separated crossing I’d be upset.

    As a pedestrian or bicyclist, if you use me to punish people in cars by forcing me to cross the street at-grade instead of having a grade separation, I’d be upset.

    I really don’t like roundabouts as a bicyclist. Richfield’s 66th Street has a great design- except for the roundabouts. There’s no red light to stop motorists and on a bicycle you approach from an angle where you have to bend your neck at an angle that would horrify your chiropractor to see if there’s a car coming through the roundabout that might turn across your path. So grade separations from bicyclists are a great next step. Washington Ave is a better design from the point of having stoplights, but a worse design from having no buffer of grass and trees between the cycletrack and the traffic lane (although having a curb is a big improvement over only paint of flim-flam sticks)

    I also like the revised design better than the original layout. Tunnels are enough of a security concern but that big underground plaza is a lot worse than a regular tunnel. Raising the bicycle trails over the highways would have been a better design.

    It also seems to me like along the state highway is a good place for the middle school. With all the school buses, facility, and parental drop offs it doesn’t seem a quaint, character filled residential street is the place for it. Even if you build decent bicycle infrastructure to it Northfield is a big city and the school year takes place mostly in the winter.

  5. karen Nelson December 2, 2019 at 4:23 pm #

    IDK – This roundabout looks like something Netherlands would do on some low volume more rural road in similar situation, that speaks well of it – yes expensive, but yes, much safer than traffic lights, and I would be happy to bike through this.

    I’m all for slow traffic on city surface streets and traffic lights as opposed round abouts in dense area – roundabouts are expensive and take up a bunch of land.

    But people run red lights at traffic lights, and even at grade roundabouts, though often less comfortable and stressful for pedestrians, they are safer.

    So a roundabout that provides fairly direct access for people walking and biking and gets them away from cars, in an area where land use isn’t so dense and expensive, seems like a good way to go.

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