We had a radio wire fence for aboot 4 years for our pups, now we've switched to a wi-fi version. Either one works well. SPTCA approved as well. Takes a little training but they will soon get the idea.
We did have once mishap involving a car in the driveway, our lab mix Belle got caught between the shock area border and a car that was backing up and she froze. The car ran over her. Broke her shoulder blade and got some lacerations and abrasions, but she recovered and is fine now. That was why we switched to the wi-fi, its mobile and easier to adjust than the radio wire version. That dog has nine lives. She's survived 2 dog vs car incidents now. One tough mutt. THe first incident that broke/dislocated her hip is why we got the electric fence. She never strayed far from our large yard, but liked to chase cars. The fence fixed that problem