纽约街头的免费机器人厕所：十分钟一到，门自己打开，不管你好了没有

A city of more than eight million permanent residents has roughly a thousand public toilets.

This has been New York's reality for a long time.

Count in the people who come into the city every day to work, study and sightsee, and the ratio looks worse still.

The consequences can be quantified.

Last year alone, New York issued more than ten thousand tickets for public urination.

Enforcement treats it as individual bad behaviour, but the sheer order of magnitude — over ten thousand — says this looks far more like a gap in public infrastructure.

This September, the city set down its first batch of answers on the street.

They are free-standing modular toilets, attached to no building, placed directly on the sidewalk.

Two went into service first, one in Brooklyn and one in Queens.

Under the plan, seventeen more will follow.

The pilot's budget is four million dollars.

The three most visible design choices in these toilets happen also to be three positions.

The first position is that it is completely free.

In a city where using a toilet often means buying a coffee first, that alone is a stance.

The second position shows up in how the door opens.

It is normally locked; you have to text a designated number from your phone before it will open.

That design exists to stop the unit from being occupied indefinitely or destroyed.

Since not everyone has a phone, the city also prepared tap cards, distributed through community organisations, which open the door the same way.

The third position, and the one drawing the most discussion, is that use is capped strictly at ten minutes.

As ten minutes approaches, the speaker inside gives one warning.

The moment the time is up, the speaker plays the same sentence in English and in Spanish: your use time has ended, the door is about to open.

Then the door slides open automatically.

Whether the user has finished, the system does not know, and will not ask.

If someone refuses to leave, the operator receives an alert and can notify police if necessary.

The rule sounds cold, but behind it is a very plain piece of arithmetic.

When the number of units is severely limited, how long one user occupies one of them decides directly whether anyone else gets to use it.

One person inside for an hour means that for everyone further back in the queue, this toilet effectively does not exist.

Ten minutes is the line New York has drawn between individual dignity and collective access.

Wherever that line goes it is guaranteed to satisfy nobody completely, but it has to be drawn somewhere.

Introducing the project, the mayor said too many New Yorkers know the feeling: you are already out on the street, and there is nowhere you can go.

Pull back a little and the significance gets clearer.

For the past several decades, many American cities went in exactly the opposite direction.

Out of maintenance cost, safety worries and liability risk, public toilets were closed, demolished and locked one by one.

The result is that the city quietly outsourced a basic human need to private businesses: whether you can use a toilet depends on whether you can afford to buy something.

What New York is doing now is trying to push that default back the other way.

And the price of pushing it back is precisely that ten-minute rule — it is what allows the system to keep functioning in a reality of many people and few units.

Free, no barrier to entry, but time-limited.

Only when all three of those hold at once do you have the whole of what it means.

Now put yourself inside it.

You are in there, the speaker begins its announcement, and the door has already started sliding aside.

Those ten minutes — how do you plan to use them?