Ok the closest I ever came to killing someone. This was 99 or 2000. I was heading west on I90 in South Dakota. I just went under an overpass and saw 3 vehicles coming down the ramp to get on. First was an older local utilities power truck straight truck of some kind with bucket lift, you know the type. Second in line was a car don't remember the make or model like Toyota Camry sized, driven by a woman. Then a pickup truck was last in line. I was hauling drywall I think to rapid city. My tractor was a 98 Kenworth T600 only a year or so old, pulling a 48' flatbed right at max gross, which is normal for wallboard. I as a courtesy got in the left lane to let everyone on, speed limit I think was 70, my truck so I was running that + most likely, I usually do limit +5-7. I am watching everyone coming down the ramp and of course the old utility truck isn't very fast so I don't have to much concern about anything with them. But apparently the car behind him did because as soon as they passed the end of the gore section she darted across it and the slow lane right into the fast lane right in front of me. I saw her, she never looked 1 time to check traffic. I immediately hit the brakes hard and started putting rubber down on the highway grabbed the airhorn cable and let her rip. The whole time saying oh F..k oh F..k I had no where to go the median wasn't an option she was to close. Anit-locks are doing their job I was slowing fast but still gaining on her, oh f..k oh f..k, closer and closer I got to back of her car thinking at any moment we are going to make contact. I got so close to her ass end that she literally disappeared from my view for a fraction of a second. Then her guardian angel must have woke up from his or her nap and saw what was going to happen , as her acceleration just started to increase over my deceleration and she started to pull away. I am not kidding when I said she disappeared in front of me. I was able to get off the brakes and get back under power. I looked in my curbside mirror and saw the utility truck and the pickup driving down the shoulder of the interstate they saw what was going to happen. I could see the utilities drivers face and he was like I can't believe that just happened. I then went from oh s..t mode to pissed off mode. And went on the chase took me a bit to get back up to cruising speed then into warp drive, but I finally caught up to her and pulled along side she wouldn't look at me or anything, so she must've at least realized what she did. I didn't want flip her off or anything I wanted her to know how close she was to dying that day because she was in a hurry. I stayed right beside her for a few miles she finally exited the interstate and looked up I pointed to her and then held up my hand with thumb and index finger together mouthing you were this close to dying today. I think she said sorry or something, could have been f..k off I don't remember now. Things happen in an instant and you have to decide sometimes in the blink of an eye if it's gonna be you or them and control what your reflexes do.