NTSB's and FAA's big push the last 5 years has been runway incursions. They tightened the reporting rules, and whoa! Reported runway incursions went up! We've gotta do something about that! So every test you take from the FAA now, there's some in there about hold short lines. Probably including balloon and glider tests, no doubt. Seminars, magazine articles, free posters to every FBO, you name it. All about runway incursions. Probably hasn't made much of a difference.