Imagine walking out onto the streets of Budapest on a weekday morning and noticing something strange. The trams are still running. People are hurrying to work. Cafés are opening, buses are stopping and cyclists are crossing the city as usual. But one familiar sound is missing: the constant noise of cars.

No engines waiting at traffic lights. No long lines of vehicles along the Grand Boulevard. No drivers searching for parking spaces in the city centre.

For one day, Budapest would belong mostly to people.

It may sound like a fantasy, but September 22 is actually World Car-Free Day, the final day of European Mobility Week. The European campaign, held every year from September 16 to 22, encourages cities to experiment with cleaner and more people-friendly ways of getting around. In 2026, its main theme is “Mobility for Everyone”, with special attention given to the needs of different generations.

Budapest has already had a taste of this idea. During the city’s Car-Free Weekend on September 19 and 20 this year, several important public spaces – including Szabadság Bridge, Fővám tér, Vámház körút and sections of the Danube embankments — were given over to pedestrians, cyclists, public transport and community programmes instead of normal car traffic.

But what would happen if we went much further? What if almost the whole city became car-free for 24 hours?

First, Budapest would sound different

Anyone who has walked through the city very early in the morning knows that Budapest has another voice when traffic disappears.

You would probably hear conversations from much farther away. Tram bells would suddenly seem louder. On Andrássy Avenue, you might notice birds that are normally hidden behind the sound of engines. On the Grand Boulevard, the familiar yellow trams would still make plenty of noise, but the background roar of cars would be gone.

It would not exactly be silent – Budapest is a city of almost two million people, after all – but it would be a different kind of noise.

And perhaps this would be one of the most surprising effects of a car-free day. We are so used to traffic noise that most of us hardly notice it anymore.

The streets would suddenly look enormous

Another thing would become obvious very quickly: cars take up a lot of space.

Think about a normal Budapest street. There may be two traffic lanes, another lane for parking, perhaps parking spaces on both sides, and only a relatively narrow pavement for pedestrians.

Remove the cars, and suddenly there is an enormous amount of empty space.

Children could play there. Restaurants could put out more tables. People could sit, talk, walk or simply stop without feeling that they are standing next to a moving wall of traffic.

This is one of the ideas behind Car-Free Day. The European campaign is not simply about banning vehicles. It asks a bigger question: Who should urban streets be designed for? During official Car-Free Day events, cities often temporarily turn roads into spaces for walking, cycling, exercise, music and community activities.

Budapest has already been thinking about this question. Its long-term mobility plan aims to increase walking, cycling and public transport while reducing the proportion of journeys made by private car.

But how would everybody get to work?

This is where our peaceful experiment becomes more complicated.

Budapest depends heavily on public transport, which would suddenly become even more important. Fortunately, the city already has a huge network. On a normal day, around 1,900 buses, trams, trolleybuses, metro trains and suburban railway trains make more than 43,000 departures.

According to BKK’s 2024 figures, around 41% of journeys in Budapest were made by public transport, while 19% were made on foot and 5% by bicycle. Cars still accounted for around 35%.

Removing those cars for a day would therefore place enormous pressure on buses, trams and metro lines.

Metro line 3 at eight in the morning might suddenly become even less attractive than usual.

A real car-free city would need more frequent services, better connections from the outer districts and surrounding towns, and safe cycling routes. Otherwise, a pleasant experiment in the centre could become a nightmare for someone trying to travel from the edge of Budapest to work.

And some cars would still be necessary

A completely car-free Budapest is not really possible – and probably should not be.

Ambulances, fire engines and police vehicles obviously need access. So do many vehicles used by people with disabilities. Shops and restaurants need deliveries. Care workers, maintenance teams, technicians and many other professionals sometimes need vehicles to do their jobs.

That is an important part of the discussion.

A car-free day should not mean making life more difficult for people who genuinely depend on a vehicle. The question is whether every journey that is currently made by car really needs to be made by car.

A short trip to a shop? Perhaps it could be walked.

A journey of a few kilometres in the centre? Maybe a tram or bicycle would work.

A trip from a distant suburb while carrying heavy equipment? That is a completely different situation.

Cities work best when people have choices.

A different way of seeing Budapest

Perhaps the most interesting effect of a car-free day would not be environmental at all.

It would simply allow us to see familiar places differently.

Imagine standing in the middle of a normally busy road near the Danube without worrying about traffic. Imagine crossing a street without rushing because the light is about to change. Imagine the Szabadság Bridge not as something you quickly travel across, but as a public space where people stop, sit and enjoy the view.

Budapest experienced something similar during its car-free programmes in previous years. The city’s activities during European Mobility Week 2023 attracted international attention, and Budapest later received the European Commission’s European Mobility Week Award for its efforts. That year’s car-free weekend attracted around 10,000 participants.

Perhaps this is why temporary car-free events matter.

Nobody seriously expects Budapest to wake up tomorrow morning and permanently remove every private car. The city is too large and too complicated for such a simple solution.

But removing cars from a few streets for a few hours can change the way people think about those streets.

Suddenly, a road is not only a road.

It can also be a meeting place, a playground, a café terrace, a cycling route, or simply somewhere to walk without constantly watching the traffic.

So what would Budapest look like with no cars for a day?

Probably quieter. Probably slower. Certainly a little chaotic at first.

But perhaps it would also remind us of something that is surprisingly easy to forget:

a city is not made for cars. A city is made for people.