In the USA, most experts believe cats should be kept indoors. There are people
who disagree with the experts, unfortunately. These people do not understand
that:
1) Cats can't read street signs or "Walk"/"Don't Walk" Signs.
2) Cats don't know enough to look both ways before crossing the street.
3) Cats don't know the difference between red & green traffic signals.
4) Dogs & wild animals can injure, maim and kill roaming cats.
5) Cats don't know NOT to ingest poisons. Many times, roaming cats can lap up
leaking anti-freeze (from a car). The anti-freeze is tasty and causes cats to
convulse and die painfully. There is no cure. Sadly, the makers of the
antifreeze have not yet banded together to add an ingredient(s) to make the
taste unpleasant.
6)People can be cruel. Some have beaten or killed cats for fun.

It's not worth the risk.