Many people do this when driving a truck when turning 90 degrees to offset the small turn radius, but I have also seen people in cars do it, which is dangerous

Many people do this when driving a truck when turning 90 degrees to offset the small turn radius, but I have also seen people in cars do it, which is dangerous for the people in the next lane. I had always wondered where that behavior came from, but now I realize that they probably are motorcycle drivers.