I answered other. The boys, all 4 of them, can go out. The girls are indoor only.

When we got Reese, our oldest girl, we had just put the indoor-only rule into effect. However, Duffy was then 4 and used to going out, so we let him continue. The other boys arrived after Reese; all of them strays; all have issues with going outdoors. One of them, Red, is neurotic. We think he goes out on the off chance his original owner might show up. Of course, he has been with us for 4 years now.

They are all in every night, and pretty much all day in the winter. Traffic is not an issue - we are at the end of a dead-end, private, dirt road. No one drives down this far - except us. And if they do hear a car, the cats run and hide.