Here's some black and white for ya. I see many cars doing this. They will actually prefer to pass on the right, accelerating into any gap on the right and yet only reluctantly driving along in line with the other cars in the fast lane. Many videos I see posted by hot shot sport bikers show swerving through traffic from left to right and back again, sometimes three lanes at a time, as if the whole road is their private playground. Passing on the right in highway speed, multi lane traffic endangers every vehicle in the area, is illegal, and shouldn't be done. If you want to go faster than another vehicle that is in your way, move to the left, wait for anything else in that lane to move to the right and then move up in line as each vehicle moves out of your way to the right when they get the chance.