Driving along the dotted lines, shoulder or reflector bumps, as though the tires were reading them, like a blind person reading braille. See also pac-manning
Dude, watch out for that car ahead of us, he's totally braille driving!
When in a car with someone else driving, and the driver starts driving over the bumps on the lane divider, you can yell out "Driving Braille!", in an indication that he is driving over the bumps, creating a rapid bump bump bump noise.
(Braille is the bumpy writing that vision-impaired people use to read)
John is driving back from a late concert through semi-windy roads with Jill in the passenger seat, John starts driving over the lane divider which causes the car to mildly vibrate and a rapid bump bump sound to start.
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.