The reasoning I see is that objects moving at the same speed in the same direction tend not to collide. I have seen advice to motorcyclists that they should be

The reasoning I see is that objects moving at the same speed in the same direction tend not to collide. I have seen advice to motorcyclists that they should be just a bit faster than most traffic. Slow enough to manage changes in traffic ahead, but fast enough that no one is approaching you from behind.