I see things when I'm driving, and hear things too. It's few and far between, like my other hallucinations. Most of these happened during my early 20s. They are usually just "flashes," like so fast they are there then gone, that I don't always count them as hallucinations.

Once I saw the leg of a giant in my rear view mirror, standing on a median in the road. This was at night. Another time I saw a dark man, also in the median, but out of my side window. He was more like a shadow, but I could tell he was wearing a long coat and looking at me. I also saw a girl with wings another time, standing on the side of the road. Another time (and this had to do with my delusions of that time,) I saw all of the energy in the city pulsing up through one of the major skyscapers and into the sky like a beam of light. I was driving at that time, too, down the highway. It was right in front of me. All of these happened at night, now that I think about it.

The auditory hallcinations I had were in the middle of the day when it was light out, though. Seeing things in the road hasn't been an issue. I am driving, and I can keep going. The screaming ambulance was what really freaked me out. It was a real ambulance, but instead of a siren it was screaming like a man in pain (as loud as the siren should have been,) and it was going oposite me on the road, so it drove right passed me. I was sitting at a light, though. I've heard that same scream in my living room.

My advice is to prepare yourself. Get to know your hallucination. You know it's not real. You have made the first step. It's not real, it can't get you. It's just an image but nothing is actually there. Also, the more you work yourself up about it, the more you might actually will it to happen. If you see them at home, you can practice. Like if you see one just think or say, "Oh, it's just you. I'm trying to sleep right now. I'll talk to you later, good night."