Is NYC Really #1 In Car Sharing?

A blog about business and economics.
Feb. 28 2013 9:40 AM

WalkScore's Misleading Top Car-sharing Cities List

NEW YORK, NY - APRIL 14: A Zipcar is displayed during a promotion of the short term car rental company on April 14, 2011 in Times Square in New York City. Zipcar debuted on the Nasdaq Stock Market Thursday under the symbol ZIP and saw its stock surge 67% on its first day of trading. (Photo by Spencer Platt/Getty Images)

Photo by Spencer Platt/Getty Images

I love WalkScore a great website that lets you assess the walkability of various neighborhoods and features an ever-growing set of amenity data. But I think their new ranking of the Top Ten U.S. Car Sharing Cities is pretty misguided. Their approach seems to have been to do a crude count of how many car shares there are in any given city, leading to the conclusion that New York is number one, San Francisco is number two, Chicago is number three, Portland is number four, DC is number five, and so forth.

But this is apples and oranges. Chicago has 630 car shares but it also has 2.7 million residents and 227 square miles of land area. DC has about a quarter of Chicago's population and just 61 square miles of land to contain its 521 car shares. Portland has about as many car shares as DC (531) but fewer people and a much larger area. It's clear that either Portland or DC is a more "car share dense city" than Chicago, and then the question of comparing DC to Portland is how much do you weight population versus land area in assessing this kind of thing. In my experience as a Zipcar user, both the per capita quantity of vehicles (which determines scarcity) and the per square mile quantity of vehicles (which drives convenience) are important factors.


Meanwhile, common sense tells you that this is a question that's best assessed on the neighborhood level rather than the city level. The relevant issue is really whether the particular place you live is well-served by car sharing services, a question that's difficult to assess from municipality-level aggregates. That's the whole reason mapping-based tools like WalkScore are valuable in the first place!

Matthew Yglesias is the executive editor of Vox and author of The Rent Is Too Damn High.


The Slatest

Ben Bradlee Dead at 93

The legendary Washington Post editor presided over the paper’s Watergate coverage.

This Scene From All The President’s Men Captures Ben Bradlee’s Genius

Renée Zellweger’s New Face Is Too Real

Sleater-Kinney Was Once America’s Best Rock Band

Can it be again?

Whole Foods Is Desperate for Customers to Feel Warm and Fuzzy Again

The XX Factor

I’m 25. I Have $250.03.

My doctors want me to freeze my eggs.

The XX Factor
Oct. 20 2014 6:17 PM I’m 25. I Have $250.03. My doctors want me to freeze my eggs.

Forget Oculus Rift

This $25 cardboard box turns your phone into an incredibly fun virtual reality experience.

George Tiller’s Murderer Threatens Another Abortion Provider, Claims Free Speech

The Congressional Republican Digging Through Scientists’ Grant Proposals

  News & Politics
The World
Oct. 21 2014 3:13 PM Why Countries Make Human Rights Pledges They Have No Intention of Honoring
Oct. 21 2014 5:57 PM Soda and Fries Have Lost Their Charm for Both Consumers and Investors
The Vault
Oct. 21 2014 2:23 PM A Data-Packed Map of American Immigration in 1903
  Double X
The XX Factor
Oct. 21 2014 3:03 PM Renée Zellweger’s New Face Is Too Real
  Slate Plus
Behind the Scenes
Oct. 21 2014 1:02 PM Where Are Slate Plus Members From? This Weird Cartogram Explains. A weird-looking cartogram of Slate Plus memberships by state.
Brow Beat
Oct. 21 2014 9:42 PM The All The President’s Men Scene That Perfectly Captured Ben Bradlee’s Genius
Oct. 21 2014 5:38 PM Justified Paranoia Citizenfour offers a look into the mind of Edward Snowden.
  Health & Science
Climate Desk
Oct. 21 2014 11:53 AM Taking Research for Granted Texas Republican Lamar Smith continues his crusade against independence in science.
Sports Nut
Oct. 20 2014 5:09 PM Keepaway, on Three. Ready—Break! On his record-breaking touchdown pass, Peyton Manning couldn’t even leave the celebration to chance.