If you see a sneaker hanging from a thread in the street, this is what it really symbolizes

Gang control of an area.
The presence of illegal activities such as drug trafficking.
A warning to other rival groups.
This type of visual cue is particularly prevalent in neighborhoods where gang conflicts are common. If you notice sneakers hanging in a risky area, this may be a sign to take seriously.

A tribute to a missing person

In other contexts, hanging sneakers serves as a tribute to the deceased. This tradition is often observed in neighborhoods with high crime rates, but it can also be practiced in more peaceful settings.

The shoes represent the life of the deceased.
They symbolize that they rest in peace or walk in heaven.
This act is intended to leave a visible mark in memory of the deceased.
It is a gesture of respect, sometimes organized by the relatives or friends of the deceased.

A Prank or a Rite of Passage
Not all dangling shoes are dangerous. In many cases, it's just a game between friends or an initiation rite.

Some young people enjoy throwing sneakers over the cables as a challenge.
This can mark the end of a period in their lives (high school, military service, etc.).
In some schools, this has become a fun tradition.
If you see sneakers hanging near a school or park, it's likely just a joke.