I have been trying to stop FluffySP from crossing the road for the last
two years.   The only thing that can be done is to lock her up all the
time and that is not an option as she loves being free.   I do lock her
up at nights though and think that this is the most dangerous time.
Unfortunately cats mark their territory and this involves crossing
roads, climbing fences and getting into the neighbours' properties.
Sometimes the attraction over the road can be another cat or cats.   FSP
had a passion for crossing the road to the flats on the opposite
corner.   A cute little half grown black and white kitten lived there
and they played together.  To my relief the kitten and the tenants have
moved away so that is one danger removed.

Bev  

Our cats have on occasion had a playmate in the neighborhood.  Jake was sad
when Oreo was moved away,  Oreo (a small tuxedo boy) would come over in the
mornings and essentially ask if Jake could come out to play.

Jo

Some cats like other cats, some don't.  You might consider planting catnip
which, if Sophie likes it, might keep her in her own yard.

I don't let Persia run loose because (1) she came to me without front claws
and even if she had claws (2) I live on a busy street corner.  Is it
possible to keep your Sophie as an indoor cat?

Another thought; Persia has an outdoor enclosure.  That's the only way she
gets to go in the OUT.  And frankly, after her experiences with the out she
doesn't want to run around.  When she's ready to come in from the enclosure
she lets me know and rushes straight for my back door.  I never have food
outside for her and of course she knows the food is on the inside (as well
as a comfy bed and lots of toys).

Jill

Thank you we never keep her food outside or let her out at night, although
it is dark in the early evening now.