Manipulate the housing market with this one neat trick

Regulations often result in unintended consequences. Money flows to find any crack in the system, after all, and often those cracks are in very odd places. Zoning and building codes are no different, and they can manipulate not just how people do business but how we built our cities.

In Marin, towns regulate density through a few different rules. Most prominent is units per acre, sometimes around 20 to 30 units per acre, but Marin’s various codes use other measures: floor-area ratio, parking minimums, minimum lot sizes, height limits, and minimum amount of open space.

Last month, the blog Urban Kchoze looked at this panoply of regulatory systems to illustrate how they alter the built environment, and found that they often don’t do a very good job of limiting traffic or population density. About Marin’s favorite regulation, units per acre, the author writes:

An interesting point to consider is what happens to the single individuals in North America that seek cheap housing options, since they are largely deprived of the small 1-Bedroom apartments due to regulations restricting the number of units that can be built per area? Well, they share apartments with roommates. Indeed, becoming roommates is the way consumers have devised to go around the excessive parking and density limitations imposed by North American planners. It is not a desirable situation, but when in a pinch, people will do it.

So North American regulations that limit the density of units but are less restrictive on FAR will result in bigger housing units as developers will build big units to maximize profits.

Policies that do the opposite, meaning limit FAR but are favorable to subdividing buildings in many units thanks to a lack of minimum lot size and low or no minimum parking regulation will have the opposite effect: tend to increase housing density but reduce the size of units.

Our current system doesn’t work very well. Rents are spiking, people are aging, traffic is growing, and the poor are crowding into tiny spaces, especially in The Canal.

As Marin continues to wrestle with the future of its town centers, especially in downtown San Rafael, leaders should figure out what exactly they want to limit. If it’s traffic, they should limit parking. If it’s kids for the school system, they should limit height but lift density caps. (Small homes don’t accommodate families well, after all.)

Marin needs to chart a way forward, but the only way to do that is to understand where we want to go, and what tools we need to get there.

SMART’s new shelter designs are even worse than before

SMART may be on the verge of making a serious mistake.

Back in August, 2014, the rail agency released its “65%” plans for stations to decidedly mixed reviews. Stung by the criticism, particularly from San Rafael mayor Gary Phillips who called the designs “ridiculous”, SMART went into a long internal huddle.

Shelter Option 1, from SMART’s “65%” station design

Shelter Option 1, from SMART’s “65%” station design

Last Wednesday, at its Board meeting, SMART offered something new. Focusing mainly on platform shelters, it proposed an alternative to the forest green “Option 1” design included in the 65% station drawings.

The new shelters, inspired by bus stops, use a “standing seam hip roof design” and are being referred to as “Option 2”. They are proposed to be painted black, although SMART staff seems willing to allow cities to paint them any color in the rainbow. Cities will have until March 31st to tell SMART whether they want this new shelter or prefer to stick with Option 1. Based on the feedback from SMART Board members, it appears that cities will be lining up for Option 2.

An inspiration for “Option 2” – Bus shelter in Duluth, MN

An inspiration for “Option 2” – Bus shelter in Duluth, MN

That’s unfortunate. The new Option 2 design has many serious downsides and will likely be viewed with regret once SMART begins its operations. Moreover, switching them out for something totally different later on may not be easy.

SMART is waiting until the shelters are chosen to lay a top slab of concrete on its station platforms. That implies that the details of the top slab (for things like utilities or drainage) are tailored to a specific shelter type. A switch to a different shelter in the future might require demolishing the tops of platforms, which would be costly and time-consuming. Given that, it’s far more critical for SMART get this decision right than it would be for a typical bus operator.

So what’s wrong with Option 2? Several things. A good rail platform shelter should have the following characteristics:

  • A very narrow footprint and open design to avoid getting in the way of customers circulating on the platform.
  • A broad canopy with an appropriate height to maximize weather protection; and
  • A nice aesthetic that is compatible with its surroundings.

Option 2 misses the mark on all of these.

Shelter Footprint

Space on SMART’s platforms will be very limited. It’s “side” platforms will be 15 feet wide, while its “center” platforms (set between two tracks) will be 18 feet wide. Let’s consider the larger of these two.

Center platforms will have two, 24 inch wide, nubby, tactile warning strips; one along each platform edge. That leaves about 14 ft. of room for patrons, or about 7 ft. on each side of the platform. With shelter Option 1, the footprint will extend about 2 ft. out from the platform center line on each side, leaving two, 5 ft. “travel lanes” on each side of the shelter. That’s manageable.

By contrast, the Option 2 shelter is much, much wider. It will extend a full 4½ ft. out on each side of the platform center line, leaving a very narrow 2½ ft. on each side of the shelter. That’s untenable.

A visual simulation on a PowerPoint slide from SMART’s recent Board meeting shows the full horror of this future condition (1:04:47 mark).

Screen capture from SMART PowerPoint – Feb 18, 2015 Board Meeting

Screen capture from SMART PowerPoint – Feb 18, 2015 Board Meeting

To make matters worse, the narrow 2½ ft. width between shelter and warning strip isn’t just a single choke point that customers will have to navigate around. The Option 2 shelters are only open one side, meaning that the “closed” side will present a long, continuous, 2½ ft. channel between platform edge and the solid glass wall of the shelter. SMART is proposing to ultimately add two or three of these monster shelters to each platform.

Suspended four feet in the air, SMART platform’s will be narrow islands, sometimes crowded with people, and far more populated with bicycles, wheelchairs, strollers, and luggage than a typical bus stop. The Option 2 shelters are going to pose great difficulties to circulating customers when SMART is in operation. While they may not violate the letter of the Americans with Disabilities Act (ADA), they certainly violates the spirit of it. Amazingly, only one SMART Director (Russell) raised any concern about space constraints.

The green Option 1 shelters will allow for far more space on the platforms. However, SMART’s 30% station design shelters had a key advantage over both Option 1 and Option 2. They were porous. They did not have a continuous wall of windscreens separating one side of the platform from the other. This openness would allow for more platform space and for customers to freely move from one side of the platform without having to go all the way around a bulky and long shelter.

SMART 30% Station Design

SMART 30% Station Design

Weather Protection

At Wednesday’s meeting, SMART Director Kellner speculated that the Option 2 shelter would offer better weather protection than Option 1. In fact, the opposite is true. The canopies of the Option 1 shelter span 12 ft., while the heavier canopies of the Option 2 shelter only span 10 ft. and provide less coverage.

Moreover, the Option 2 canopies only offer weather protection on one side, according to SMART’s drawings. On the “closed” side of the shelter, the roof only extends a few inches over the wall of long glass, which will offer no weather protection at all.

The one-sided and enclosed nature of these bus stop shelters prevents customers from easily and casually ducking under the canopy on a rainy or hot sunny day. They have to deliberately and consciously move into the enclosure on one side, squeezing through the 2½ ft. wide choke point.

Aesthetics

Much of the politicians’ comfort with Option 2 seems to stem from the look, which avoids garish green paint and offers a more familiar shape. In the words of SMART Director Mouton-Peters, it “fits the cultural ethos” of Marin. The new shelter design was reportedly partly inspired by the shelters at the San Rafael Transit Center.

While beauty is subjective, I doubt most Marinites cherish the Bettini Transit Center’s shelters. Without a doubt, the most beautiful things in Marin County are inherent in the place itself: the green and gold rolling hills, the oak trees, and the historic town centers.

The best thing that a transit shelter can do in this environment is to stay simple and clean and get out of the way. SMART Director Rabbit offered some of this perspective when he wondered if these big, black, bus shelters might end up blocking views of more cherished places and structures near the stations. They will.

Little House on the Platform

A misguided approach on shelter design can begin easily enough. When most people think of a “shelter”, the most comforting image that comes to mind is a house. Then, when people think of an iconic shape for a house, the most classic vernacular is a triangular pitched roof. In fact, SMART staff noted that the new Cotati Depot building also partly served as an inspiration for the Option 2 shelters.

Unfortunately, a triangular roof that drains water into gutters on either side tends to be very heavy. It’s not structurally possible to cantilever the canopy very far. Moreover, the weighty triangular roof can’t be supported easily by narrow support columns in the center. It requires a much wider base, just like a house. That leads to bulk. The problem is that rail platforms are not spacious enough to accommodate a bulky “house” while also serving the increasingly complex function of patron circulation and access.

Lessons from Utah

In the 1990’s, Salt Lake City was part of a wave of light rail development in the United States. Some of the TRAX light rail stations, however, were designed with wide, black, bulky shelters that look remarkably like what SMART is now proposing. The result was difficulties with customer circulation and safety on the platforms. Trolley Station in Downtown Salt Lake City, pictured below, is a textbook example of excessive platform clutter.

Trolley Station – Salt Lake City, UT

Trolley Station – Salt Lake City, UT

Perhaps trying to moving past this mistake, the new shelters proposed for the 2013 North Temple Bridge/Guadalupe Station (which serves both light rail and commuter rail) in Salt Lake City are decidedly different. The design by Hatch, Mott MacDonald, offers some excellent characteristics.

SLC Trolley 2

First, the shelters are narrow at the base to avoid clutter and to allow for easy circulation and safety. They are porous to allow movement from side to side. They have wide spanning canopies for good weather protection. They drain to the center, so that water doesn’t land on passengers’ heads. They allow for some natural light to come through, are simple, and basically get out of the way to allow for views of mountains and cityscape. And lastly, the name of the station is positioned below the canopy where it can be read easily by people on the platform and in the train.

SMART’s Option 2 shelters literally offer none of these important features.

Where to Go Now

For SMART, it’s been a continuous climb down on stations. They began with a professional design led by an architecture/engineering firm with transit experience, not unlike Hatch, Mott, MacDonald.

Then, SMART turned the design of stations over to its construction contractor, Shimmick. Now, they spear to be doing something even worse, taking hail-mary design advice from the Sonoma County Transportation Authority (SCTA), a funding agency with no transit operations, railroading, or architectural experience. It’s the SCTA who suggested the Option 2 bus shelters.

Cities along the rail line should not take the SCTA’s recommendation and should rally around shelter Option 1 for the good of the SMART’s system. While imperfect, it at least avoids the serious problems presented by shelter Option 2. If painted a more neutral color than the proposed forest green, it could be a respectable piece of station furniture.

Of course, while it may be too late, the best long-term outcome for both the riding public and taxpayers would be for SMART to implement a truly professional shelter design that considers the myriad details of the customer experience.

What do driverless cars mean for suburban planning?

Self-driving cars are coming, and boosters of drivable suburbia are hoping they will be a potent weapon against mass transit and cities. But what they mean for towns and suburbs isn’t quite so clear.

For the past 80 years, the US has transformed nearly every place in the country into one that is acceptable and welcoming to the personal automobile. It needs places to park (some estimates have that there are 6 parking spaces for every car), needs enough road space to be able to drive unimpeded, needs sole control over the roads, and so on.

In places built in the past 30 years, this has meant sidewalk-free eight-lane boulevards and massive malls at freeway interchanges. In places built before the car, this has often meant their wholesale destruction. (Santa Clara and Fremont, for example, are now undertaking efforts to “rebuild” their town centers.)

This has not been in service to the car as a vehicle, however, but to the car as a personal mobility tool. Very often, the only seat used in a car is the driver’s, massively enhancing the person’s footprint and leading to all kinds of horrific traffic.

With the advent of the driverless car, the belief is that we will no longer need personal vehicles, and this excess footprint will become unnecessary. Open up an app on a phone, order a car, and a vehicle (possibly with others in it going to roughly where you’re going) will drive by, pick you up, and drop you off near your destination. Along the way it’ll pick up other people going in roughly the same direction as you, bolstering capacity of the personal car to a grand total of five.

Five trips, one car. As one Twitter follower called it, it becomes mini-mass transit, but at the beck and call of an app and as flexible as it needs to be. If this method of travel becomes ubiquitous – and that’s a big if – then the personal automobile might become a thing of the past.

What, then, of the places we’ve outfitted at great expense to fit the personal automobile? These would need to be retrofitted to fit this new dominant mode, and we can do away with some of design choices that favored the personal automobile.

Probably the biggest change is the demise of the large parking lot. These huge slabs of asphalt dominate suburban commercial landscapes, often taking up 80 percent of commercial parcels. They dominate the streetscape, and arterial suburban roads are lined with them. Without personal vehicles to park, there’s no need for a parking lot. That land could be put to productive use.

All this will be wasted space.

All this will be wasted space.

With a transportation system that’s five times as efficient, too, there’s little need for wide arterial roads packed with single-occupant vehicles. As well, without human drivers, there’s no need for “forgiving engineering” focused on driver psychology and driver needs. We can narrow lanes from 12 feet (freeway width) down to 10 feet or even 9.5 feet and have the same vehicle capacity and speed. There would rarely be a need for roads wider than 2 lanes in the suburbs.

So, we can wave goodbye to parking lots and wide arterial roads. What could we do to optimize the suburbs to fit this new reality?

First, trip origins and destinations would be best served if they are along the same axis of travel, and they should be relatively evenly spaced and close together. Street grids lined with origins and destinations make sense, so as to maximize the directness of the travel. That means either a commercial street with homes behind or above.

With the loss of parking lots, it makes no sense to place storefronts far back from the street. They should be placed against the street to ease access for passengers.

Finally, there will likely be a need for a short walk to or from a vehicle, especially when returning home. It makes sense to make that walk a pleasant one, and to put amenities there, too.

corridor-capacity1

Relative capacities of modes

It’s important our density not get too high. Although boosting car capacity fivefold is a huge step forward, trains have eight to forty times the capacity. For the highest-density areas, where trains are already at capacity, driverless mini-mass transit won’t be enough to solve congestion or to adequately meet residents’ travel needs.

So in the retrofitted suburbs, there should be a balance between the need for a dense line of origins and destinations and the need to not overload the system. Perhaps just six stories, at most, in the most dense places of the suburbs.

For this kind of system to work and not devolve into that kind of nightmare, it needs to have simple and easy lines of operations, just like the streetcars did, with origins and destinations located near stops. Unlike streetcars, the whole street is a possible stop. Rather than a series of one-dimensional stops surrounded by a station area, there is a two-dimensional transportation corridor surrounded by a transportation area. The station neighborhoods currently in existence could easily be integrated into suburban corridor fabric.

At this point, this does not sound much like the suburbia we often consider “suburbia”. With no parking lots, no wide roads, a street grid, and shops and homes clustered up against the sidewalk, it sounds more like a town center. That’s because this transportation cloud functions much more like the streetcars of the old days than personal cars of today. The urban landscape described is precisely the kind of bus-transit-oriented development that suburbs could be investing in today. This article could have painted just the picture: “Imagine standing at almost any street corner, where every five minutes an electric train bus vehicle comes by…”

Indeed, if this system ever does overcome myriad regulatory hurdles, it will work best in places where buses and light rail work best. If this is our dream future, then we can start planning for it today. There’s no need to wait for driverless cars.*

Of course, this system will likely be decades away, if it ever happens. There are huge regulatory hurdles to any driverless car, and any area where this system operates could be seriously disrupted by even one person driving their own car. As well, there are still questions of who owns and maintains the vehicles. In the interim, personally owned automated vehicles will likely start to ply the roads. (While they will reform how we use parking, they won’t do much about traffic.)

But if this system does come, it’s not something for champions of small towns, walkable living, and transit to fear.

*As people start to buy personal driverless cars, the need for vast parking lots will diminish. If we really want to start planning for that reality, too, then we should reform or abolish parking standards today. 

AN ASIDE: This system has been speculated upon for decades as Personal Rapid Transit, or PRT, though generally it was theorized on rails. In fact, it already exists, in a sense, in Morgantown, West Virginia.

Much of the time, Morgantown’s system works like an elevator (push a button to summon a vehicle, push a destination button and you’re on your way). During rush hour, it operates like standard-issue fixed-route transit during peak hours, and in off-hours each car runs the whole track as a circulator.

Tautological housing study reminds us that demand is more than skin deep

A few weeks ago, the Wall Street Journal reported on a new study by the National Association of Home Builders which found just 10 percent of people born after 1977 want to live in the urban core; the rest want the suburbs or rural areas. The catch was that the study group was only those who had bought a house in the past three years or who plan to do so. In other words, people who want to buy a house want to live in a place where they can buy a house.

But the study, an exercise in tautology if there ever was one, does add some value to the overall discussion about what today’s young homebuyers want out of a home, and the reaction to the study shines light on the foolishness of urban-vs-suburban partisanship.

What the study says

Just 10 percent of young homebuyers want to stay in the central city, while 68 percent want to move to the suburbs. These suburban homebuyers tend to buy smaller, older houses relatively close to the central city, and they put a premium on being within walking distance of amenities like restaurants, stores, schools, and transit.

This is not the typical car-oriented suburb. Rather, it’s a suburban town, the sort of place that grew up along the old streetcar lines before they vanished. It’s a place that can accommodate trips made by car, transit, biking, and walking.

It seems the same things that draw young people to cities remain valuable even when those same young people leave.

What the study leaves out

The NAHB study is a stated-preference study. In other words, it looked at what people said they wanted rather than what they actually did when presented with options, which is called a revealed preference study.

This is most clear in the disconnect between the cost of housing in a dense, walkable urban place and the cost of housing in a sprawling, drivable place. Outer-suburban and exurban homes were the first to lose their value during the Great Recession and have been the slowest to recover. Meanwhile, dense, central cities have seen the cost of housing soar, as have walkable towns near those cities.

These price signals are quite clear: the supply for outer-suburban and exurban homes exceeds demand, and the demand for central-city homes exceeds supply. Similar price stability and price spikes along transit corridors and in the old walkable streetcar suburbs shows this demand isn’t simply for central city homes but for walkable living.

More than that, the study doesn’t scratch the surface of where young people would want to live if central cities had similar prices and similar school quality to the suburbs. After all, the draw of the suburb might not even be a function of the suburban or urban form per se but a simple function of how inhospitable American cities are to raising a family.

Or perhaps it’s simply housing availability: most new housing development has been in the exurbs, and central cities have been housing laggards.

This last theory is held out by analysis by Jed Kolko of real estate analyst Trulia. Last week, he tweeted the following three charts:

Image by Jed Kolko

Image by Jed Kolko

Image by Jed Kolko

Image by Jed Kolko

Image by Jed Kolko

Image by Jed Kolko

Growth in population closely matches the growth in housing units across the urban spectrum: the more homes, the more people. In fact, a read of the last two charts shows that neighborhoods are adding households faster than homes in all but the most suburban neighborhoods (deciles 9 and 10), with the most pronounced difference in urban neighborhoods (deciles 2-4). As a result, the growth in home sale price is highest outside of the most suburban neighborhoods. While the most urban neighborhoods saw their prices go up fastest, it was the least urban neighborhoods that saw their housing supply and population rise fastest.

This is due to a number of factors, but the largest is the $400 billion worth of federal subsidies (PDF) poured into the most suburban of places. Given the price rises in more urban areas, it seems as though this and state-level policies are working against the underlying demand rather than chasing demand.

It’s a stupid debate

Anti-urban partisans are always quick to crow about the end of the cities and seem eager to pounce all over any shred of evidence that might support this thesis, context be damned. Anti-suburban partisans, alas, do the same about evidence for suburban demise.

Yet being a partisan for a particular kind of urban form is nonsense. The great structural debate about housing and transit in the United States is fundamentally about whether the provision of housing in all its forms has adequately satisfied consumer demand.

The NAHB study doesn’t presage the slaughter of the city and triumph of the suburb any more than the fact that Americans aren’t driving as much presages the opposite. It presents a look at where young homebuyers say they want to live (namely, in places where they can buy homes).

What does this mean for Marin?

Young people want places that look like Marin: walkable, suburban, not too far from the city, with a decent transit network. Consumer demand surveys of all young people, not just homebuyers, found that the strong bias towards walkable living is found among renters and homebuyers alike.

The problem, of course, is that there isn’t enough San Francisco, or Marin, to go around. As I have insisted since the beginning of this blog, the demand for new homes in Marin should be channeled into enhancing and spatially expanding our downtowns.

San Anselmo, for example, has space for 79 of new apartments above stores within its downtown core. That’s 79 new families that could be living and shopping in a totally walkable environment. If downtown zoning were expanded to highway commercial zones, that’s room for dozens more new families and businesses.

Marin could push against its own struggling town centers and try to hem them in, or it could take this as an opportunity to build upon the formula that works: walkable towns adjacent to nature. There is room enough for the entire spectrum of suburban home types in Marin. We can take advantage of that demand, and build a greater Marin out of it.

What did the Bay Area look like in the Age of Rail?

A few years ago, I published a map – really a cartogram – showing the service patterns of Marin’s old Interurban system, the light rail that covered all of Central and Southern Marin. Now, I’m starting on something a bit bigger: what did the Bay Area’s rail network look like in 1937?

The Interurban map was motivated out of a sense of confusion about the system. Maps of the time just showed where rails went and what stations were along them, similar to road maps, but contemporary transit maps are different. Rather than showing the rail network, they show the service network – how trains move along the rails.

The resulting map lifted the fog from the system. Rather than just a musty map, I could see how someone could actually get around Marin on the Interurban.

This new project comes from a similar motivation. I’ve seen old maps of the Bay Area, like the one below, but they don’t give a good picture of what goes where and when. Sometimes they leave out or demote rival rail companies. Sometimes they are too low-resolution to show how different lines split off. And they never show how frequently service runs.

So far, thanks to a kind Twitter follower, I’ve obtained a 1,500-page scan of the 1937 rail guide, learned how to read the thing, and started to wrap my head around the Oakland lynchpin of the system. I’ve also determined that I won’t map local-service railroads, like Muni, the Key System or the Interurban. A regional street map doesn’t show local streets, after all, and focuses instead on the freeways. This map will focus on the “freeways” of the regional rail system – the fast, intercity service.

Still undetermined is how much to show. Do I show frequency? It varied wildly: while Western Pacific’s Scenic Limited only left once per day, Southern Pacific ran hourly commuter service between San Jose and San Francisco. Do I show the hierarchy of stations? Palo Alto is a major stop on the Peninsula, while Lawrence was frequently skipped on the same line.

My progress so far is fairly limited, but I’m using Oakland – the most complex part of the system – to try out variations on stop design, font, colors, and how to differentiate service styles. Stay tuned for updates.

The latest Oakland draft

The latest Oakland draft

The poetry of The Greater Marin

You may not know it, but The Greater Marin is on Twitter. It’s fun, really, to get in touch with people who agree and disagree with me from all over the world. Follow me, if you don’t already.

A new tool turned all these tweets into semi-coherent poetry. The result made me smile, so I thought I might as well share.

S!@# Together

North San Jose neighborhood
And design for your speed limit!
That does not sounds good.
Of Cut Wood. CUT WOOD, DAMMIT.)

Police, and idiot pedestrians.
Buses, like the GOOG shuttles:
Heh. Vegans.
Urbanist world: cars uber alles.

Inane of nuances of Marin politics.
With the new barrier, not less.
Hearts drown performance metrics.

The county and bring up some gold.
Napa, Capitol Corridor, and Marin.
Not smaller. Just slower and cold.

We’ll be back Monday, but if you can’t wait, find me on Twitter.

More people are speeding on the Golden Gate Bridge – here’s why

16073676100_24d1279e0a_z

The new barrier and the bridge during closure. Image by David Yu, on Flickr

When the new Golden Gate Bridge barrier opened, it was heralded as a new age of safety, but there were rumblings of problems immediately. Bridge Manager Kary Witt was quoted as saying, “I do think everyone is driving too fast. Everyone needs to slow down.” A few days later, he was rather more forceful: “We’re seeing too many drivers driving 20 to 30 miles over the speed limit. It’s completely unacceptable.” While the district seems to have been caught off-guard, this was an entirely predictable result.

Keeping roads safe is one of the most important tasks traffic engineers have. To do this, they will often try to improve a road’s safety by making it more forgiving of driver error: make the lanes wider, smooth out the curves, remove trees, and add median barriers. But this sort of improvement assumes that people drive a set way without regard to their environment.

This is not true. People drive as fast as feels safe, and they subconsciously react to visual cues to tell them what that speed is. Have you ever driven along a road at what felt like a comfortable speed, only to find that you were going 55 in a 35 zone? You were a victim of this subconscious pressure, called risk compensation.

By removing dangerous obstacles, engineers will often paradoxically make a road less safe by encouraging higher speeds. In a limited-access highway this might be okay, but on roadways that aren’t limited access – like the Golden Gate Bridge – it can create a dangerous false sense of security.

This is precisely what is happening on the bridge. Before, drivers on the bridge had a very visible cue that danger was omnipresent as traffic whizzed by in the opposite direction just a foot away. People would drive slower to ensure they had control of their vehicle and wouldn’t accidentally drift into traffic. They also had to navigate the very tight space between toll booths, slowing traffic further.

By removing the toll booths and adding the center barrier, the bridge district has lowered the perceived danger of crossing the bridge. This has encouraged drivers to drive faster, which has resulted in more crashes.

This is not a limited access roadway, either. There are driveway entrances and exits at the Toll Plaza and at Vista Point. Pedestrians and bicyclists cross the bridge on its sidewalks. This is a recipe for disaster.

It is perhaps understandable that the district would choose to spend millions on a median barrier. It was a harrowing crossing, and I know I never drove in the left lane if I could avoid it. But it is baffling that the bridge district was apparently unprepared for higher speeds as a result of this change.

There is a lesson here: traffic speed follows design. If towns and cities in Marin want to reduce speeds and increase safety, it must design roads that encourage people to follow the desired speed. The Golden Gate Bridge District has done the opposite, telling people to go one speed while silently encouraging them to go faster. If it’s serious about keeping speeds down, it won’t rely simply on enforcement to keep speeds down but will also seek design solutions.

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