I am driving in the lane to the left of the lane on ramp vehicles merge into. And I saw a car begin to merge into that lane. I must have been going 75mph when a car whips past me on the right. must have been doing 90 mph. He does a sharp swerve to the left to avoid the merging car in front of me. I immediately take my foot off the gas as he veers left right and left and cross over three lanes. And of course, the are cars all around. He does a 360 right in the middle of the lanes and I have slowed ready for him to come back into my lane. But, he comes to a stop facing the opposite direction in the HOA lane. Then he does a u-turn and continues on his journey. If the road wasn't damp, am sure he would have rolled, but he just spun. No one was hurt. Funny, I wasn't shaking and kept my cool to avoid him. But after that, I sure was alert. I still can't believe he didn't touch any other cars.