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.
by Laura Chatterton May 03, 2007
When one used the lane markers/bumps to indicate they've gone into the next lane, sometimes causing panic to those in the car.
by The Madame May 28, 2009