I'm given to think that even if you did have a perfect image file of a properly weathered stretch of pavement, that actually printing it out would probably ruin the appearance. To my eye even of the colors and markings were spot on, tarmac just doesn't look like printed paper.
Get yourself a piece of plywood. Glue to it a sheet of medium grit sandpaper. Paint it, mark it, weather it.
I made this base by taking a 2' x 2' piece of plywood, covering it with white glue, sprinkling it with model railroad ballast, and painting it. Even in 1/24, pavement has texture that a printer just can't replicate.
