Street Design Manual of the New York City Department of Transportation." /> Street Design Manual of the New York City Department of Transportation." />
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Jeff Speck

New Words on the Block



NYC Street Design Manual's illustration of major street features. Design: Pure+Applied


About a month ago I received a package in the mail from my co-author Andres Duany. It was the New York City Street Design Manual, with a cover letter imploring me to look at the paper. “It feels just right — so green! We need to use the same paper for our manual.”

Indeed, the slightly rough, porous paper is one of many details, tactile and otherwise, that add up to the just-right feeling of this timely and valuable book (if one can call a tabbed loose-leaf binder a book.) Every aspect of this product feels positively 21st century, except perhaps its unerringly even-handed treatment of the broad range of solutions it offers — solutions that span the spectrum from the mundane to the revolutionary.

Andres need not have sent me the manual, as I already had a copy, received from the City of New York’s on-line shop after a long wait. It came just in time to help me with comprehensive pro-walkability street redesign efforts that I am working on for Oklahoma City and Davenport, Iowa. Just how much it was able to help me, and where it fell short, will be one subject of this essay.

But first, let’s dispense with the obligatory assessment: Do you need to buy this $35 book? Yes, if you are involved in any way in the design of city streets. Yes, also, if you can plop it on the lap of someone who is. Since this collection of best practices is put forward as the recommended policy of our nation’s biggest city, its potential clout makes up for any flaws or limitations in its contents. Of course, its only weakness as a political tool stems necessarily from the same source: I can already hear my Midwestern clients complaining that they don’t want to become New York. But we know that deep down, just a little bit, most of them would like to share some of the magic of America’s most sustainable city.

The book is clearly organized in four sections: Using the Manual, Geometry, Materials and Lighting. It is written well and simply, and illustrated with both drawings and photographs from New York and beyond. Where a recommended practice is not yet built locally, a peripatetic photographer has spanned the globe (or the internet), so we see rain gardens from Portland, integral curbs from Miami Beach and imprinted asphalt from Taranto, Italy.





But more impressive, and daunting, than the collection of best practices is the collection of government agencies that have come together to create and embrace this manual. In his introductory greeting, Mayor Bloomberg cites the “eight City agencies” that have helped the Department of Transportation with this effort. I count 17 — plus 10 more at the state and federal levels. This list includes a number of agencies that one suspects were instrumental in pushing for the manual’s reforms, foremost among them the enlightened Department of City Planning, no doubt supported by the Department of Environmental Protection and the Metropolitan Transit Authority. It also includes those agencies that, in other places at least, tend to work every day to the detriment of our streets as public spaces. I am talking about the state departments of transportation, and local public works and fire departments, which tend almost universally to value the free flow of vehicles over the spatial and social qualities of city streets. It is no doubt the participation of these agencies that has led to this manual’s lack of teeth on certain key issues.

For example, take my absolute favorite sentence in the manual:

“To reduce pedestrian crossing distances and reduce impermeable, heat-absorbing coverage, the paved roadway of all streets should be designed to be the minimum width — and have the minimum number of lanes — that safely and cost-effectively allow for the desired operations of motor vehicles, buses, and bicyclists.”

This is the sort of sentence that brings tears to the eyes of urbanists and environmentalists everywhere. It cannot be faulted. But read the last part again. Who is going to determine what the desired operations of motor vehicles are, and when they call for more or wider lanes? That is the sort of caveat that has been shown to kill walkability from coast to coast, unless precise measures are put in place to ensure the slower driving speeds that the manual advocates.

A 10-foot-wide driving lane, the historical standard, induces motorists to drive at speeds that are safe for nearby pedestrians. Many city streets, reamed out by Neanderthal postwar traffic engineers, have lanes that are 12 feet wide or more. These highway-size lanes induce highway speeds. In most of the cities in which I work, I have to fight to reduce 70 MPH lanes to 30 MPH lanes, and I am always searching for my holy grail, the official government document that is going to make my job easy. I’m still looking. Why can’t a manual that specifies the exact width of six types of bike lanes discuss the size of a car lane with any precision?

The other frustration brought on by this otherwise remarkable manual comes from its somewhat schizophrenic treatment of sustainability. While the text advocates unfailingly for planted and high-albedo (reflective) surfaces, stormwater-absorbing roadbeds and low-energy lighting, these solutions are then offered as few out of many, typically at the end of a longer list of less sustainable alternatives. One needs to flip through a dozen conventional streetlights before coming across two low-carbon LED standards. Why does New York have to approach LED as a “pilot” project, when Ann Arbor has already re-outfitted its whole downtown?

These criticisms point less to flaws in this manual than to the need for a sister document, not a handbook but an ordinance, that mandates the use of its more sustainable and pedestrian-friendly solutions. The Street Design Manual is a necessary but not sufficient document, an important and exemplary first step toward the humanizing and greening of the public spaces of New York. Its very existence is a bit of a miracle. But whether it ultimately achieves the goals of its creators will depend on the courage and political skill of city leaders, who will need to overcome the old-school thinking and departmental inertia to which even New York City is not immune.


Posted in: Cities + Places, Planning, Politics + Policy, Urbanism

Comment 12  |     |     |   Like 1  |   Tweet 0
Comments [12]
I think it would be useful to point out that the entire manual is available online (PDF) at http://www.nyc.gov/html/dot/html/about/streetdesignmanual.shtml

Jerry Vandesic
09.15.09
02:25

I started with the pdf this past summer but immediately had to have the real thing. As these types of documents go, this is a must have for all the reasons that are stated in the post.

In the article Jeff asks, "Why can’t a manual that specifies the exact width of six types of bike lanes discuss the size of a car lane with any precision?" Perhaps this is so because these types of lane dimensions are in fact fixed in the quantitative analysis of traffic engineers, in "green books" that are already published, and state traffic manuals with all there warrant requirements.

Lane requirements are also and based upon reams of data about accident statistics, design speed, etc. that have massive case law backing them up. It is unfortunately still too easy to talk about bike lanes, width of sidewalks, etc. in mainly qualitative terms because in these latter areas the data is just starting to emerge. As the data does emerges, the stranglehold of single purpose street design will gradually be opened up. More street types and lane widths that serve a multiplicity of purposes and functions will emerge, and more compromises on the use of existing lane widths will have to be made to satisfy both emerging safety and demand criteria.

The New York Manual is a great first step as well pointed out in the post, and it is amazing and wonderful that it ever happened, and speaks to how fast this field of design is maturing.
John Kaliski
09.16.09
02:14

The New York Manual is a great first step as well pointed out in the post, and it is amazing and wonderful that it ever happened
العاب
09.16.09
07:58

I should think a manual that specifies the exact width of six types of bike lanes should discuss the size of a car lane with any precision.
Seyi Olugbesan
09.16.09
09:31

My favorite sentence in the Manual is policy Goal Two (p. 21):

"Design for Access and Mobility: Accommodate all street users,
giving priority to the most energy– and space–efficient modes."

If there is any question about the desired operations of motor vehicles and the number and width of lanes, Goals 1, 2, 3, 4 and 7 specify the priorities.

Of course, the rubber hits the road in negotiations with engineers, fire marshals, and other officials with a say in street design. That's where some solid numbers would give strength and support to the policy Goals.
Laurence Aurbach
09.17.09
10:31

san francisco has an excellent new street manual too...

http://www.sfgov.org/site/uploadedfiles/planning/Citywide/Better_Streets/index.htm
jon
09.17.09
01:51

The lane width question is a good example of why all modes on the street must be considered. Many buses are 9.5 wide mirror to mirror and can't safely function in lanes narrower than 11 feet. As with many issues, it depends on what the role of a street is in a city's circulation system.
Nathan Landau
09.17.09
05:22

For New York design professionals the NEW DOT revelatory. And the provision of standard guidelines through the Street Design Manual is a huge step. I attended a lecture and open house at DOT's new conference space at 55 Water Street on Wednesday and enjoyed the presentation of the manual. Beyond the useful guidelines and recommendations there are also two sections focused on approval processes which will be extremely helpful to us. I will be posting more about the Lighting Section and my response to the presentation this weekend on http://lenischwendinger.wordpress.com/
I am also interested in hearing about other cities guidelines - please email leni@lightprojectsltd.com .
Leni Schwendinger
09.18.09
02:13

One more thing per Mr. Speck's review, "Why does New York have to approach LED as a “pilot” project, when Ann Arbor has already re-outfitted its whole downtown?"

The level of misleading public information on "LED streetlighting" is galling. If you parse the real, complex inputs about public lighting; IES guidelines, new LRC research, light trespass issues, wattage per kilowatt hour as a better standard than wattage per sq ft. etc., you will realize that "LED lighting" is not a simple matter - and does not necessarily win as a sustainable alternative to other new light sources such as new generation ceramic metal halide lamps with control options (I am not naming brands here). Be sure, I am not against LED - I am designing lighting fixtures that are LED-based, but cautioning against simplistic statements that are misleading.

For more reading on public lighting - please locate the debate between myself and IDA representative Susan Harder on this website, or through my blog:
http://lenischwendinger.wordpress.com/2009/08/28/design-observerchange-observer-debate-a-thousand-points-on-light/
Leni Schwendinger
09.18.09
02:24

@Leni - because no other cities exist besides NY
tricky P
09.18.09
04:24

This is truly an amazing endeavor and all credit should go to Wendy Feuer at NYC DOT. She was the person responsible for the initial idea, putting it all together and art direction.
Abby Goldstein
10.27.09
03:55

I just read through the entire article of yours and it was quite good. This is a great article thanks for sharing this informative information. I will visit your blog regularly for some latest post.
amanda
06.28.10
09:15



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