Yes, this is a feature of migraine. I get these, exactly as you describe - sometimes as they disappear they look a bit like a Chinese kite with a long tail....often feel a bit spaced when they happen but pain doesn't always follow them. In me, the triggers seem to be tiredness, stress and low blood sugar. They knock out the vision on the side that they disappear to, so I can broadly see but not read. Fortunately, never had one when driving.
I'd just have a think about how you were when the attack occurred - were you still tired? Had you gone a long time without eating the day before? And as Invisi says, they might not happen again, but if they do, try and pinpoint what is triggering it.