Hello, I agree with the accountability paper route, and a serious meeting. They will not fill in the paper work for a variety of reasons/excuses. Have spot checks early in the morning or when they are editing and confront them with that their responsabilities include not only station camera gear, but maintenance and upkeep of station vehicles as well. This was a problem for me about a year ago. I did the paper work, wrote their asses up, put it in their file, and tried to make them understand they represent the station, and when a reporter complains to me, and the complaint pans out, **** happens. Shifts change, day off requests are rejected etc. Keep daily records of vehicle by number, who drove it last, and how much gas is in it when you make your spot check. Surprise is the best element. Believe me, my own vehicle has wrappers,(paper, not singers) in it at the end of my shift. I simply empty out all the loose paper and move on. I also had the ND agree to hire a car cleaner that comes to our station, every other week. One week wash, next time interiors.We are looking much better now. Also detail every 6 months. This vehicle upkeep is a job in itself. Better if they leave the vehicles at the station every night. That way early or late you can keep an eye on oil changes, inspection stickers, fuel, cleanliness, tires, damage,etc. Stick with it and it will work out for you. You must give each photog an assigned vehicle, even if shared to pull this off. Accountability is the key phrase. No excuse,no mercy.I could write a book about irresponsible photographers driving vehicles unfit to be on the road, but that was in another world. Good Luck...