Hello! Our chickens (4 female buff orpingtons) have a smallish run (about 12 x 4 feet) attached to their coop which is completely predator-proof. When we are travelling on business, they stay safely in there. When we are home, I let them out of the run to free range on 15 acres. For some reason, they almost *always* go down the driveway, away from the house, down to the road... rarely exploring the fields, gardens, or other "safe" places. They've even crossed the road to explore the farm across the way! 
We only have four hens, and they are our pets. We'd be devastated if they were killed on the road; particularly when it seems so unnecessary for them to go that direction in the first place!
Which brings me to my questions:
Can I install the green chicken fencing (I believe it's 4' high) and expect Orpingtons will stay inside? They aren't amazing flyers... but would they try to fly up & perch on the top of the fence (and then fly over...)? Or, do we need to invest in something electric, like PoultryNet? If we do go with an electrified fence, does this still work in the Winter with feet of snow, or should I expect to keep them closed in the run all winter? Also, with the electrified fencing, can it actually hurt them? I don't want them to be enclosed in a space, feeling afraid... do you know what I mean?
Thank you for your help - I'm a newbie to this!

We only have four hens, and they are our pets. We'd be devastated if they were killed on the road; particularly when it seems so unnecessary for them to go that direction in the first place!
Which brings me to my questions:
Can I install the green chicken fencing (I believe it's 4' high) and expect Orpingtons will stay inside? They aren't amazing flyers... but would they try to fly up & perch on the top of the fence (and then fly over...)? Or, do we need to invest in something electric, like PoultryNet? If we do go with an electrified fence, does this still work in the Winter with feet of snow, or should I expect to keep them closed in the run all winter? Also, with the electrified fencing, can it actually hurt them? I don't want them to be enclosed in a space, feeling afraid... do you know what I mean?
Thank you for your help - I'm a newbie to this!