He's full of it about the line going solid of course, BUT, there is an optical effect that can occur when you pass about 125 m.p.h. If you're on black top and the broken lines are white, you'll actually see some flashes of red between the black and white. Your eyes can get tricked by an 'information overload' that affects your optic nerve, or so I was told, and it only happens with black and white. Try it out, but on a track only, please.