Car-Free Streets Reduce Noise and Air Pollution. More Cities Should Have Them
Lead image by Connel_Design / iStock
By Liam O’Brien
Every summer, cities around the world host car-free days and temporarily pedestrianize streets. Following their success elsewhere in the world, temporary pedestrianized streets are becoming more common in North America, such as for large sporting events, cultural festivals and farmers’ markets.
This year, as part of the FIFA World Cup, some cities in North America created pedestrianized fan zones for spectators and visitors. In Vancouver, a large stretch of Granville St. in the downtown core.
Doing so can help support local businesses, give public spaces back to people and retrieve them from cars. The City of Vancouver recently announced that Granville St. will remain pedestrianized until at least September.
Pedestrianized streets emerged in Europe more than seven decades ago. The two most notable precedents are Lijnbaan in Rotterdam and Str酶get in Copenhagen. Despite apprehension from some business owners and a minority of drivers, many success stories have put those concerns to rest while often exceeding expectations.
These streets have proven to be major draws for pedestrians and cyclists, without needing to inefficiently devote public spaces to private vehicles. Critics often worry that pedestrianization simply shifts traffic elsewhere. While the effects depend on local design, many cities have found that .
Pedestrianized streets are often evaluated economically, but their health benefits receive far less attention. Our at 杏吧原创 University measured air and noise pollution experienced by people walking and cycling along Ottawa’s Queen Elizabeth Driveway (QED), with and without the presence of vehicles.
What we found
The QED is part of the , which temporarily provides long stretches of its scenic roads to people on foot and bike. The program dates back to 1970, making it a pioneer.
However, despite when downtown residents otherwise lacked recreational space and the adjacent pathways were overcrowded, the hours have since become restricted to daylight hours on weekends.
The QED presents a particularly enticing research opportunity because the roadway is exclusively open to pedestrians and cyclists on certain weekend hours in the summer. Accordingly, a near-perfect natural experiment allows the impact of vehicles to be measured.
We measured particulate matter and ultrafine particles (both of which are produced by cars and have ) and noise at 12 measurement stations along the roadway.
Traffic noise is ; . Measurements along the QED from a combination of weekdays and weekends and at three times per day showed that air pollution was typically about 70 per cent higher when cars are present, while perceptible noise was about 50 per cent higher.
The presence of this noise may make the difference between being able to have a comfortable conversation and having to shout and strain to listen. Similar results were found in other studies, such as New York City’s Highline, which is an above-ground railway that has been converted to a pedestrian pathway.
noise and air pollution were almost 40 per cent lower on the Highline relative to the street level. The impact of pollution and noise is particularly acute for stationary road users, such as diners at patios, who cannot easily move out of harm’s way.
The future of pedestrianization
Some might think that new technologies like electric vehicles will absolve vehicles of noise pollution. However, EV noise can approach the level of gas-powered vehicles 鈥 鈥 due to tire noise, air turbulence and horns. And while EVs eliminate tailpipe emissions, their .
The health and safety benefits of pedestrianized streets extend well beyond air pollution and noise. Without vehicles, collisions with people are virtually eliminated.
In 2023, one-quarter of the 1.2 million global road traffic deaths were . Not only are those deaths tragic, but the perceived risks prevent people from taking up cycling.
There are numerous to walking and cycling. Ensuring that our cities have ample, pleasant and safe spaces to do so, particularly with access to amenities, would be a critical step forward for public health.
As YouTuber Jason Slaughter of the channel once said: 鈥淐ities aren’t loud; cars are loud.鈥
While the implementation details of pedestrianization are important, uncertainty should not be feared. Pedestrianized streets benefit people, businesses and the planet. It’s time to rethink our cities, especially the most car-centric ones.
This article was co-authored by Kabir Patel, an undergraduate student at 杏吧原创 University’s Department of Civil and Environmental Engineering.
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Liam O’Brien聽is a professor of building engineering at 杏吧原创 University.
This article is聽聽from The Conversation under a Creative Commons licence. All photos provided by聽聽from various from various sources.
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