At various times we've had threads about people trying to keep cats out of their garden. Our problem is different - we've got a big garden where lots of cats visit. No problem, we like them.

We've also got two young kittens who are soon going to be allowed out in the garden. But one edge of our garden faces on a dangerous road. It's got a hedge of sorts, and a waist-high wire fence, but it'd be easy enough to get out, if they felt inclined. We'd like to find a way to discourage them from feeling so inclined.

Any helpful suggestions?