After reading this, I realized that procedures concerning unlocked vehicles have changed but the rules as written have not. The rules have since been amended. I apologize and accept responsibility for any confusion this has caused.
For the time being, the only unlockable vehicle open to public use are the green Skoda cars that Del referred to. However, bear in mind that these cars are not ownable, not yours to destroy, and are meant to be used only until a player secures a better means of transportation. Buy a cargo truck or something as soon as you can afford it. DO NOT store your gear in the Skoda, hide it in the woods and log out, unless you plan to log immediately back in and reclaim it. An admin will find it, no matter how well hidden, and return it back to an area where it can be reused. I have relocated Skodas more than once with more than enough gear in them to buy a nice vehicle.
Please understand that the reason for creating and locating the cars as we do is to be able to more tightly control the number of vehicles on the server. It is all about the framerate and server efficiency and this benefits all players.
Thanks for your patience.
Sandman