My daughter was driving my son's Plymouth headed eastbound on Old Highway 66 in Winslow, Arizona. We were going to Sonic Drive-In. My son was in the passenger seat and I was in the back r/h passenger seat and my daughter's boyfriend was in the back l/h passenger seat. My daughter noticed it first and screamed, "Oh my God, there's an asteroid!". She pulled the car over to the left of the road and got out of the vehicle. I watched through the moon roof as it was open fully (we all watched in amazement). It was extremely bright. A large ball of fire with a huge tail flashing across the sky toward the Little Painted Desert. It seemed to disappear behind the clouds as it got so close to the earth as if it actually landed, which I have a strong instinct that it did. It did not move fast as a meteor would, nor was it bright white like a meteor, nor was it small like a meteor. It was huge! I've never seen anything like it in my entire life. The most incredible part was that it did not burn out..... My daughter remarked that she was certain that it had made contact with the earth. I'm pretty sure it had as well. My son was so frightened that he had a panic attack and had to take medication because he was afraid that we were in mortal danger. My daughter, a student at Northern Arizona University, is familiar with Astronomy and knows the composition of asteroids and what damage the impact of an asteroid could make made comment on such an event. Also, the incredible rarety of an asteroid actually passing through the earth's atmosphere and actually not burning out. So, this is why I'm posting this report to you.