Vehicles
Vehicles! In theory these should help you get around quickly. In practice they attract hordes and break down right when they shouldn't.
Vehicles and you!
There are many vehicles and I don't want to spoil them all for you guys and gals.
Vehicles in a whole as they are spawned are noisy, broken, or nonexistent. The noise is from gasoline powered engines, so it is not uncommon to remove the gas engines and replace them with electric ones. Some are quiet but are overly heavy and are slow.
DIY
It is entirely possible to build your own vehicle, it takes a great amount of resources though. I won't go into specifics because vehicles vary.
Vehicles need at the bare minimum: One built Frame, At least two wheels, and An engine of somesort You can add as much as you want to vehicles, very few restrictions exist.
So how about do I go building a death mobile? Well I would first get a starter vehicle. Then I would attach blades to the outside, or some lawnmowers. Then I would put on some turrets (drop ammo on them to load). Then attach an extra fueltank and get owning!
Note: This article was edited by Gtaguy, and needs some polish.