I had to dig a bit for the March 2011 issue of muse Magazine, but here's your answer:
Park-way dates back to the horse-and-buggy days of the 1860s. two architects invented the word to describe tree-lined boulevards they wanted to build near Prospect Park in Brooklyn, NY. The name caught on, and they built parkways(without the hyphen) for cars.
Driveways were private roads leading to either a house or an outbuilding such as a stable or barn. When garages for cars came along, they were separate buildings. The attached garage(to the house) didn't come along until the 1940s, and that's when driveways came to mean short concrete ramps used mainly for parking.
And there's the history of it. I'm not sure if you were asking out of genuine curiosity, but oh well.
