In its latest parking report, the Department of City Planning claimed that residential off-street parking is not linked to increased driving, contradicting previous research. In response, the parking policy experts who produced that research are reprimanding the agency for jumping to conclusions based on insufficient evidence. The flub by DCP could have big consequences, because it undermines part of the rationale for eliminating parking mandates.
At the end of last year, DCP released a report setting the stage for changes to off-street parking regulations in the “inner ring” — areas of Upper Manhattan, the Bronx, Brooklyn, and Queens that have good subway access.
“The report has many valuable findings,” NYU parking policy expert Zhan Guo said in an email, “but this particular one and the associated policy conclusion does not make any sense.”
Car ownership in the inner ring is below the citywide average: 65 percent of inner ring households are car-free, and 28 percent own one car, compared to citywide levels of 54 and 32 percent, respectively.
People who do own cars in the inner ring are most likely to park them on the street for free: 59 percent said they used on-street parking, mostly near their place of residence, while 39 percent used off-street parking.
On-street and off-street parkers used their cars for similar purposes, with on-street parkers slightly more likely to have used their vehicles in the past seven days for virtually all types of trips, from errands to visiting family and friends. Notably, on- and off-street parkers differed significantly on commuting to work: On-street parkers were 50 percent more likely than off-street parkers to drive to work, with nearly half of people who stored their cars on the street saying they drove to work in the past seven days.
DCP said its data does “not support the hypothesis that Inner Ring households with an off-street parking space use their cars more frequently for journey-to-work trips than households that park on-street.” At first blush, this contrasts with research from NYU’s Guo, published in 2013, and parking policy expert Rachel Weinberger, published in 2008 and 2012, showing that availability of at-home off-street parking in New York City neighborhoods increases the likelihood that a car owner will drive for a range of trips, including journeys to work.
A closer look shows that DCP’s data does not give any reason to question existing research. There are two key reasons why. “The destinations matter,” Weinberger said. “It also makes a difference where your off-street spot is.”