Left Dearborn with my daughters at 15:00 driving I-94W to Kalamzoo. It was a sunny day. Approximately 10 minutes from Westnedge exit a thick gray cover enveloped the car. Could not see any cars, brake lights, and no sound of cars colliding. The gray covering left and all of the cars were facing in various directions. There were no accidents. We all straighted our cars out and left. When I arrived at my friends house they were outside wait for us. I had called before leaving at 15:00 and they expected us at about 17:15. They said they were worried because it was after 19:00. That's when I noticed the sun was lower in the sky. This has been bothering me for 13 years. How can this happen during rush hour and on an freeway? I feel a need to try and locate some of those people to talk with them, but have no idea how to do so.