I recently painted the road between the engine yard and the mainline, and I wanted to add the white lines at the road edge. On my farm road I did many years ago, I masked either side of each line and then painted the lines with white paint, but that was very laborious and there is always the risk of the paint getting underneath the masking tape.
Here is the road, painted with latex paint
My friend Boyd Misstear suggested the pinstriping product made for adding decorative lines to RC aircraft.
36' costs $1.99 from Tower Hobbies, I got a roll and tried it out tonight. It went on quickly and easily.
I have added some weathering to the road and dulled down the white lines a bit with some black paint. See pictures in telephone poles entry.