Buggy!
It’s amazing how much a single vehicle can change the feel of a game. Far Cry 3 had cars, but the simple addition of the Buzzard in Far Cry 4 transformed the way players traveled and attacked in that game. In the Following, the Buggy has a very similar effect. Planning approaches, reaching locations, and even dealing with enemies can be altered by your vehicle and whatever upgrades you’ve decided to add to it.
Techland did more than than just add a car to the game, though. They made it a part of the world. You have to care for it in the same way you care for your weapons and tools. You’ll upgrade your buggy for more speed and power, repair it after dealing with too many enemies (and poor driving skills), and even keep it fueled. It can be a distraction to get you in and out of places, or a means to escape a touchy situation.
It adds a new dynamic to play in the same way that opening the world up did.