Mapping vehicle emissions in the Chicago metropolitan region

The New York Times maps and discusses vehicle emissions across American metropolitan areas:


Even as the United States has reduced carbon dioxide emissions from its electric grid, largely by switching from coal power to less-polluting natural gas, emissions from transportation have remained stubbornly high.

The bulk of those emissions, nearly 60 percent, come from the country’s 250 million passenger cars, S.U.V.s and pickup trucks, according to the Environmental Protection Agency. Freight trucks contribute an additional 23 percent…

Suburban driving, including commuting, has been a major contributor to the expanding carbon footprint of urban areas, Dr. Gately said.

But, he added, “Even in the densest cities, the vast majority of trips still happen in a motor vehicle.” These trips include work commutes, school drop-offs and millions of other daily errands as well as freight deliveries and other business traffic, each of which contribute to planetary warming.

The United States has organized much of its society around driving. Plus, many Americans like driving or the benefits they believe driving offers. It will be hard to enact quick large-scale changes to this though smaller efforts (such as fleets of electric vehicles or denser suburban areas) could add up to change over time.

The data from the Chicago area is interesting. Like most metro areas, the emissions are centered on major highways with some of the areas with most emissions being the Kennedy Expressway, the Dan Ryan Expressway, I-88 at I-294, and I-88 at I-355 (these are likely areas with high levels of congestion and gridlock). From the maps, it is hard to know how much of the emissions come from freight trucks but I would imagine the proportion could be high in the Chicago area given its central location, highways, and intermodal facilities. Chicago ranks 5th in total emissions – behind New York, Los Angeles, Dallas-Fort Worth, and Houston – and the per-person emissions ranks on the low end of metropolitan areas. Although the region is the third largest metropolitan region in the United States, it does have more mass transit than a number of other regions.

Reasons for replacing “Freeways Without Future”

A new report from the Congress of New Urbanism titled “Freeways Without Futures” looks at the ten urban highways and interchanges that need to go. Why might cities pursue these projects? Here are some common themes in such plans:

1. Reconnect neighborhoods and communities that highways split. When constructed, highways with their width and imposing traffic split social collectives. Or, highways can impede development by providing a barrier. Removing the highway allows for more pedestrian traffic as well as more meaningful connection between residents and businesses on both sides of the highway. New development can span the former highway or help bridge the divide.

2. Create more green space. Highways are the result of auto-oriented urbanism that trampled over and through communities. Removing the highways allows for more parks and trees, among other natural features. Plus, it reduces noise and emissions from the highway (though these might be simply moved to another kind of thoroughfare).

3. Remove eyesores. Highways can create visual blight on the urban landscape. Highways block sight lines and present an imposing concrete structure. Without their presence, particularly elevated highways, people are free to see more of the city.

4. Removing the highway could be part of a larger project of reducing dependence on cars and vehicles and a shift toward mass transit and pedestrians. Removing the above-ground highway is one step but that same highway could simply be routed elsewhere or underground without affecting transportation choices.

A country of roving electric car fleets

Andrew Yang is not the first to propose this though he may be the first presidential contender to do so: replace car ownership with fleets of autonomous vehicles.

He told MSNBC host Ali Velshi that “we might not own our own cars” by 2050 to wean the United States economy off of fossil fuels, describing private car ownership as “really inefficient and bad for the environment.” Privately owned cars would be replaced by a “constant roving fleet of electric cars.”…

“What we’re really selling is not the car, it’s mobility,” he said. “So if you have mobility that’s then tied into a much more, if you had like, for example, this constant roving fleet of electric cars that you would just order up, then you could diminish the impact of ground transportation on our environment very, very quickly.”

Americans like driving and have integrated vehicles into all sorts of daily activities. This would not just be about replacing the ability of a car owner to get into their vehicle whenever they want and drive around; this could change how houses are designed (garages could be placed elsewhere or eliminated), the fast food business, big box stores, rush hour (perhaps there would not or should not be enough vehicles in the fleet to meet the needs of current rush hour), road trips, and more.

It is interesting to consider how willing people would be to do this. Is this really just about mobility? Interest in driving may be lagging for younger Americans but do they want to give up cars altogether (or privately owned autonomous vehicles that could be more like rooms) in favor of vehicles that are shared with others? Would such changes require denser housing or could it enable more sprawl? If given choices about what changes to make regarding climate change, would people favor other options rather than giving up cars?

American laws privileging driving, zoning, and differential effects

A law professor summarizes how American law reinforces driving in multiple ways:

A key player in the story of automobile supremacy is single-family-only zoning, a shadow segregation regime that is now justifiably on the defensive for outlawing duplexes and apartments in huge swaths of the country. Through these and other land-use restrictions—laws that separate residential and commercial areas or require needlessly large yards—zoning rules scatter Americans across distances and highway-like roads that are impractical or dangerous to traverse on foot. The resulting densities are also too low to sustain high-frequency public transit…

As a matter of law, the operating-speed method is exceptional. It enables those who violate the law—speeding motorists—to rewrite it: Speed limits ratchet higher until no more than 15 percent of motorists violate them. The perverse incentives are obvious. Imagine a rule saying that, once 15 percent of Americans acquired an illegal type of machine gun, that weapon would automatically become legal. Other legislation amplifies the harm from this method. In California, for example, cities are sometimes obligated by law to raise speed limits against their will, and local governments are barred from lowering them even for safety reasons. This occurs against a backdrop of radical under-enforcement of the speed limit nationally, and the widespread banning of proven but unpopular lifesaving technologies such as automated speed cameras.

Just as telling as what activities the law regulates is whose interests it seeks to protect. Dozens of our peer nations require carmakers to mitigate harm to pedestrians caused by their products. U.S. design regulations, however, require only measures that enhance the safety of car occupants. Just as SUVs are becoming taller, heavier, and more prevalent—and pedestrian fatalities are surging—U.S. regulators have not required carmakers to embrace those more comprehensive design standards. Instead, they’ve launched campaigns baselessly blaming pedestrians for their own deaths…

In a similar spirit, criminal law has carved out a lesser category uniquely for vehicular manslaughter. Deep down, all of us who drive are afraid of accidentally killing someone and going to jail; this lesser charge was originally envisioned to persuade juries to convict reckless drivers. Yet this accommodation reflects a pattern. Even when a motorist kills someone and is found to have been violating the law while doing so (for example, by running a red light), criminal charges are rarely brought and judges go light. So often do police officers in New York fail to enforce road-safety rules—and illegally park their own vehicles on sidewalks and bike facilities—that specific Twitter accounts are dedicated to each type of misbehavior. Given New York’s lax enforcement record, the Freakonomics podcast described running over pedestrians there as “the perfect crime.”

Several related thoughts after reading the plentiful examples:

  1. The first example provided involved single-family home zoning. Cars and homes are intimately linked in the United States and particularly in the suburbs.
  2. I would be interested to see more discussion of how the legal structures arose alongside the rise of driving in the United States. Was it a back and forth? Did the quick acceptance of driving push the legal system in certain directions or did early legal changes give driving a boost?
  3. The approach of this article reminds me a bit of The Color of Law with the emphasis on the legal system. And the overall argument seems to be that such laws force Americans into driving. But, are there precedent-setting legal cases that could reverse this? Does the legal preference for driving rise to the level of discrimination? A case could be made since driving is expensive and owning a reliable car and driving is related to class which in the United States is also tied to race. Homeownership helps build wealth for certain groups that own but could driving also do the same? Or consider spatial mismatch where jobs and economic opportunities might be hard to access without a significant drive via car.
  4. How might this change with driverless cars and autonomous vehicles? The current system seems to privilege drivers but what if there are not drivers but rather processors, companies, and vehicle owners?

Get creative and sell home and new car together as package deal

Thinking about an earlier post linking new upscale car purchases with suburban gentrification, I had an idea: why not sell more homes and new cars together as a package deal? Here are reasons this could be a good pairing:

  1. Americans like the lifestyle that comes with a single-family home and driving a car. It is particularly important in the suburbs where owning a home and the ability to drive rank high in importance. Put these two big purchases together and sell a whole lifestyle.
  2. Both a home and a car are a status symbol. Pairing the two really provides an opportunity to brand the owner. Would someone want to purchase a McMansion but still drive a two Toyota Tercel or a Pontiac Aztek? Or, retire and downsize to a nice urban condo and keep driving a minivan or an older model SUV? Matching the home and the car at the same time provides a unique opportunity to establish oneself.
  3. I wonder if there are some “efficiencies” in purchasing both at the same time. On the producer side, developers and dealers want to move properties and cars; if selling them together helps, this is a deal. On the buyer side, perhaps they can roll all of the costs together and just pay one lump sum a month for two important items. (Mortgage documents might be hard enough to put together, let alone a joint document rolling together a mortgage and a car loan). Could it all be cheaper for the buyer (or get the sellers/lenders more money in the long run on interest)?

I would guess there are also good reasons this is not done widely. Still, given how much Americans like buying properties and like driving and cars, there may be potential here.

Linking nicer cars to a suburb on the rise

From the Australian suburbs: one insider suggests seeing nicer cars in driveways signals good prospects for the suburban community.

The gentrification of the driveway happens before the gentrification of a suburb, says the boss of a data analytics company.

Upmarket vehicles beginning to appear in the carports and garages of houses is often a forerunner of a suburb on the rise, as renovators move in...

When more models such as a BMW X5 or an Audi SUV begin appearing in the driveway of houses and apartments in particular suburban streets, it is a reliable predictor of a suburb undergoing gentrification and becoming much more popular with renovators. Extra investment in community infrastructure often followed, and there was a broad flow on to higher property prices…

He said households who were taking out a loan for $500,000 to buy a rundown home in an up-and-coming area were often also purchasing a $30,000 to $40,000 car to fit the aspirational lifestyle.

The article chalks this up to a big data insight as bringing together multiple pieces of information helped reveal this relationship. I can see how this new information might help investors but it is less clear how this would help residents or local governments.

More broadly, this gets at something my dad always said: look at the cars in driveways, on the street, or in parking spots and it gives you a sense of the people who live there. In societies that prize cars, such as in the United States and Australia and particularly their suburbs, a vehicle becomes an important social marker. The one-to-one relationship might not always work as some people buy more expensive cars than their housing might indicate and vice versa (recall the stories of millionaires driving old reliable cars). Yet, on the whole, people of different social classes drive different vehicles in varying states of repair. Hence, various brands aim at different segments of the market. Famously, General Motors did this early in the 20th century with five different car lines to appeal to different kinds of buyers.

UPDATE: I probably did not contribute to this upward trend with long-term ownership of a Toyota Echo. But, it looked good for its age.


Two data points in transportation change: NYC subway ridership peaks in 1946, US non-commuter rail traffic drops after 1945

That the automobile came to dominate American social life and physical spaces after World War II is clear in multiple ways but two recent points of data I saw helped drive this point home.

Start in an obvious place: New York City. On one hand, the use of mass transit in New York City is unparalleled in the biggest American cities. On the other hand, subway ridership peaked in 1946:

1946: Subway ridership peaks

Subway ridership has never been as high as it was in 1946, and a precipitous decline began in the late 1940s as automobiles became widely available. The busiest station in the system, Times Square, saw its ridership drop from 102,511,841 riders in 1946 to 66,447,227 riders in 1953. Subway expansion would become increasingly difficult to justify as New Yorkers were abandoning the existing system—even though outward expansion was just what was needed to keep the subway as the region’s primary mode of transportation.

To a less obvious place: Toledo, Ohio. In the late 1940s, the city proudly constructs a new train station amid a growing population and optimism about the future. And then train traffic fell off dramatically across the country:

In the 20 years following Toledo Tomorrow, non-commuter rail travel in the U.S. collapsed, falling 84 percent nationwide, thanks in large part to the airports and the ribbons of limited-access high-speed roads Bel Geddes had foretold. Five years after the new railroad station opened in Toledo, the New York Central put it up for sale. Eight years later, the Beaux-Arts Pennsylvania Station in New York City would be demolished; five years after that, the New York Central and Pennsylvania railroads combined to form Penn Central, then the largest merger in American history. It would become the largest bankruptcy in American history two years later.

There is little doubt that the car is a nearly essential part of American culture today but it was not always this way nor is it guaranteed to be in the future. Reversing or countering a major trend is always difficult, particularly when its tentacles are everywhere and embedded in infrastructure and culture. To truly move to other forms of transportation would require not just fewer cars and vehicles on roads but a massive reconfiguring of American society.