RUNWAY NUMBERS AND MARKINGS
Pimp your airport with these common runway numbers and markings. You will need some sort of anarchy mod (I recommend sharp road angles, since it also enables you to make more realistic highway interchanges) to place most of them, since under normal circumstances you can't place an object on top of a road/highway/runway/taxiway.

All items appear in the Transport/Plane category. They need no power/water/road connection, and produce no happiness/entertainment value. They're just meant for additional dressing. All are about 100 polys or less, and considering you won't use very many of these, the performance impact should be minimal.