It is enough to take a brief look at the name of the series - Grand Theft Auto, to understand what role do transport play in the game. Almost each mission, objective and game event in Grand Theft Auto 5 has something to do with vehicles. All vehicles in GTA 5 are based off real-life prototypes (There are exceptions like Rhino tank, which has no real prototype, however you may notice similarities with German "Leopard-2" tank). Usually, they have completely identical real analogues, but with different names (including brand) to avoid troubles with legal owners. Albany Emperor, for example, is just a renamed sedan Cadillac Fleetwood. We are quiet sure that even the most versed cars' fan will be satisfied with the game.
Of course, by saying "vehicles" in the same context wtih GTA 5 we don't mean autos only. There are a lot of all different kinds of vehicles possible, for example: motorbikes, helicopters, planes, boats, trains... Yup, vehicles in GTA 5 dominate not only land, but both air and sea. And like in other games of the series, there is also a military vehicles (tanks, jets, helicopters), capable of unleashing few liters of liquid lead upon heads of your enemies. Vehicles in GTA 5 are divided into 21 types, and there is 262 vehicles in total, each of which is portraied in exceptional quality, has it's unique sides and features. Rockstar definitely mad an astonishing work when creating transport for GTA 5.
Actual quantity of vehicles doesn't stop on number 262, however. All the vehicles in-game have a lot of different characteristics (speed, acceleration, braking, parameters of handling, etc) and they all are the subject for enhancing. There is an unique feature in GTA V - the autotuning. Take a car you like to a garage and tune it by your likings. In case you forget about your unique tuned car somewhere, don't be too sad as you can pick it up on a local police station, for a small fee, of course. Also, feel free to customize your cars away from PC/console, as there is iFruit companion application for your iPhone.