Kylie walks pretty nicely on the leash, but at least 1x on each walk (and never more than 3x), she will lunge after a car that passes us. Usually this happens with a car that approaches from behind, but sometimes with a car that approaches from in front.
She doesn't do this with every car. We generally have 5-10 cars pass us while we are walking. I have no idea why she chooses particular cars to lunge after. It's pretty frightening when she does it though.
Any ideas about how to train her NOT to do this?