I almost creamed a guy on a motorcycle weaving in and out of traffic at what appeared to be about 90 mph. I was changing into a left lane to pass an OTR truck and this guy literally came out of nowhere and "stole" the lane. I had my signal on but he obviously ignored it. Thank goodness I could get back in my lane before I ran him over. He continued up the road at a frantic speed passing cars between lanes. He obviously didn't care for his safety or others but I would have unfortunately been in horror had I killed him. I understand what the law is about having to yield until it's safe to move over into a lane, but other laws start to infringe on that. Like aggressive driving and speeding. What trumps what? If I have a clear lane change and someone speeds up into that space beyond the legal speed and I run them over, who is at fault? Even if the other driver isn't speeding, if I have a lane change and I am clear, signal and start to move over and someone - even going the speed limit - also moves into the same space, who is at fault? Are they at fault for ignoring my signal, or am I for moving over even at the time of the start of my change I had the space? The other driver actually created a situation and/or failed to avoid an accident.