What Happens to a Street When the Cars Leave?

I read about Oxford Street on the morning it closed.

Almost a kilometre of it, from Orchard Street to Great Portland Street, shut to cars, buses, taxis and bikes. The photos showed people walking down the middle of a road that, for as long as anyone can remember, belonged to red buses nose to tail.

Most of what I read about it was about shopping. Footfall. The Christmas rush. Whether the big brands would come back.

Which is fair. It's a shopping street.

But I kept thinking about something else.

I've lived in Barcelona and in Vienna, two cities that took space back from cars in very different ways. And I remember moving through those streets differently. Walking slower. Stopping more. Talking to whoever I was with without having to raise my voice.

I never thought much about why at the time.

So what is a street actually for, once it stops being a road.

The easy version

For a long time, I'd have said the answer was obvious. Take the cars out and the street gets better. Cleaner air, less noise, more room.

Done.

The plans for Oxford Street mostly say the same. The Mayor's announcement promises more than fifty new trees, over a hundred seats and two new public squares by the end of spring 2027. The stated aim is to give people "more reasons to visit, stay longer and return more often".

I believe the first half of that story. The evidence for it is good.

It's the second half I'm less sure about.

What the air remembers

The clearest test I found comes from Canada.

In Ottawa, the Queen Elizabeth Driveway is closed to cars on summer weekends and handed to people on foot and on bikes. The rest of the week it's an ordinary road. Same place, same trees, same weather, with and without traffic. Researchers at Carleton University used that as a natural experiment, putting twelve measuring stations along the route and comparing the two.

When cars were present, air pollution was typically about seventy percent higher. Perceptible noise was about fifty percent higher.

But the line that stayed with me wasn't a number. The researchers pointed out that this noise can be the difference between having a comfortable conversation and having to shout and strain to listen.

I sat with that for a while.

We usually talk about traffic in terms of danger and lungs. Both matter. But a street where you have to shout is also a street where fewer people bother to talk.

Barcelona has the longest record of trying the opposite. Its superblocks close the inside of a group of city blocks to through traffic and give the space back to people. An evaluation of the first three, published in BMC Public Health, found that residents and workers in all of them reported better wellbeing, calmer surroundings and better sleep. They also reported more social interaction.

And then a quieter detail. In one of the superblocks, the same intervention calmed traffic in one part and not in another.

Same design. Different street.

The noise that came back

The finding I keep returning to is a small one, from a study of Barcelona's newer green streets in the Eixample district.

Researchers from the Autonomous University of Barcelona used seven permanent noise monitors to compare the streets before and after they were pedestrianised. One year on, the average daily sound level had dropped by 3.1 decibels. The biggest drops were in the new squares, where two of the green streets cross and through traffic is furthest away.

People noticed. In a survey of residents, fifty nine percent of those living on busy traffic streets said noise affected how they used their street-facing rooms, compared with forty seven percent on the new green streets. People on the calmer streets also used their balconies more.

So far, the expected story.

Except for one window in the week. On weekend afternoons and evenings, the sound levels were about the same as before.

The cars hadn't come back.

People had.

The study's title says it plainly, Quieter except on weekend evenings. The researchers' reading is that, at the busiest moments, the sound of people out in the street had moved into the space the traffic left behind. Talking at tables. Sitting in the squares. Staying.

The lead researcher argued that fears of pedestrian noise becoming worse than traffic were unfounded, at least in the places they measured. I believe that. I also suspect that whoever sleeps above one of those squares on a Saturday night has their own view.

Still, I find it strangely hopeful.

A street gets loud again. But with voices.

Who pays for the quiet

I don't want to tell this only as a happy story, because it isn't one for everybody.

When Oxford Street closed, the buses moved to new stops roughly two hundred metres away. For me, two hundred metres is nothing. For someone older, with a bad hip and a bag of shopping, it can be most of the trip.

The scheme seems to know this. Mobility scooters are still allowed, and there's Blue Badge parking nearby. Those are careful choices. They're also an admission that taking a road away takes something from somebody, and it tends to be the people who were already finding the city hardest to reach.

There's a second thing that bothers me more.

The case for Oxford Street is mostly an economic one. It's a street with around £3.1 billion of spending a year, and the stated goal is to put it back among the great shopping destinations of the world.

Nothing wrong with that. Most of us like having a place like it.

But a pedestrian street built mainly for spending can still be a street nobody lives on. Calm can be sold too. It can be the quiet you get while you're on your way to the next shop.

I go back and forth on this more than I expected to.

A reason to stay

So maybe the useful question isn't cars or no cars.

Taking the traffic out seems to do what it promises. The air gets better. The noise drops. People can hear each other again.

But that only makes a street possible. It doesn't make it a place.

What makes it a place is whether it gives people a reason to stay that isn't buying something. A bench you don't pay for. Shade in August. A square where two paths meet. Somewhere a parent can stand for ten minutes while a child runs in circles.

In the loneliness piece, I ended up arguing that belonging comes from repeated, low-effort reasons to run into the same people. When I wrote about children walking to school, the same thing showed up in a street closed for an hour.

A road can't give you any of that. It's designed for you to pass through.

A street can. Not automatically. Only if someone decides that standing still is a use worth planning for.

Maybe that's why the weekend evenings in Barcelona are the part I trust most. Nobody had to be there. They were there because the street had become somewhere to be.

The middle of the road

I keep looking at those photos of people walking down the middle of Oxford Street on the first morning.

Everyone is moving. Phones out, bags in hand, heading somewhere.

In a year, I don't think the question will be whether people walk there. They will.

It'll be whether anyone sits down. And whether the same person sits on the same bench twice.

A road tells you where to go.

A street, if it works, gives you a reason not to.