Number in tractor door is US DOT 139595 or USDOT 137595. Pulling Trailer with Illinois license plate # 90F 3HN. On November 8, 2018 (6:20 P.M) we were travelling in a work zone proceeding North bound on Illinois Rt 55 approx. 6 miles south of Pontiac, Illinois and travelling at 55 miles per hour (speed limit is posted 55 MPH). A Swift Truck Driver then drove up behind us- so close being 1 to 2 feet from our rear bumper that all you could see of the truck was a portion of the front grill when looking out of our back window. He kept tailgating us at this speed. My wife finally had enough and pulled to the side. This unsafe and dangerous Swift Truck Driver should be investigated by Swift and replaced. He is a detriment to the Swift Organization and is going to get someone killed!