The very first time I ever drove the rig, a person parked on the side of the road decided to fling open their door just as I passed. Bad enough I wasn't confident about the dimensions of the rig, but I would've taken the guy's arm right off too. I damn near had a heart attack...and then my partner would've had two patients lol
To follow along what JPINFV stated, the closer you are the less the person in front of you can see (your lights as well as whats in the next lane). If I had a big rig right in my back seat, there's a good chance that I also can't see if the next lane is clear to pull over. If you create an environment where people will freeze in their response you are going to make situations worse.