There was a big scrolling marquis sign at ground level near a road I used to drive on frequently. At a certain point the letters had that "constant bearing" pro

There was a big scrolling marquis sign at ground level near a road I used to drive on frequently. At a certain point the letters had that "constant bearing" property. If I wasn't paying too much attention I would just get the feeling that ~something~ was coming fast at me from the side and would hit me. I would have to fight my instinct to swerve away and consciously reassure myself that it was just the sign that I saw.