Discription of Events: At 9am on 7/2/2021 Traveling on I-43 south past Delavan where construction is down to 1 lane. When the construction ended and went back to 2 lanes before Darien, I moved to the left lane to pass a car in the right lane in front of me. The silver Audi A4 car was behind me and decided to pass me on the left moving at 85+mph driving through the emergency lane and gravel and then cutting me off while moving back into the left lane within 1 inch of hitting my front left car door and fender. If I had not reduced speed and moved to the right side of the left lane a collision would have been imminent. There was a purple dodge caravan in the right lane of traffic during this time, so I could not move much. This could have resulted in a 3 car deadly accident.