Driving from Cherokee Pass MO to St.Charles MO on I-55 this afternoon. Somebody was on the CB saying there was an accident. We went over a knoll and - BAM. A car had hit another semi, spun out and was facing oncoming traffic. Car pieces were spread around the lanes. Luckily, Spouse was driving and was able to miss both the car and debris. Thank dog I wasn't driving, because I can't react that fast.