driving by braille 

This occurs when someone who is driving on the freeway consistently drives on the white reflectors to guide their path as opposed to driving in the center of the reflector lines. Much akin to a blind person running their fingers over the special bumps to read something.

Hey are you gonna stop driving by braille or what? It's giving me a headache.

driving by braille by Laura Chatterton May 17, 2007

Driving by Braille 

When one used the lane markers/bumps to indicate they've gone into the next lane, sometimes causing panic to those in the car.

Ted: -drives over the bumps-
Alex: Dude, what're you doing? Driving by Braille?!

Driving by Braille by The Madame May 28, 2009