Do the road with magnetic paint and add magnets to the cars. Playroom or little boy's room. I think the better idea would be to place this on the floor rather than teaching kids to drive cars on the walls.
I can't even express how much I love this nursery. The crib is perfect! The name frames above the crib is adorable. I love the comfy chair next to the crib for rocking to sleep and reading together. The tree on the wall is even cute.