A system to let the player take cover from gun fire is a feature that has debuted with the introduction of over-the-shoulder view in Grand Theft Auto III and has been immensely expanded in Grand Theft Auto IV. Games that uses the bird's eye view have very little form of cover, mainly only running behind objects to hide from gun fire.
In GTA III, in order to cover from gun fire, the player is limited to running behind cars and structures, or crouching behind objects. With the introduction of crouching in GTA Vice City, the player can run behind shorter structures that are otherwise pointless in GTA III so the player's body is less exposed to gun fire. This is especially advantageous on the PC version where the bullets travel to the crosshair and not obstructed by barriers usually experienced using the console or classic controls. Powerful weapons that can only be targeted in first-person view in the console or classic controls are extremely useful in the PC version being able to target in third person view. GTA San Andreas added the additional ability to travel while crouching and rolling over sideways while crouching. In LCS there was a feature to crouching but it was cut.
Grand Theft Auto IV dramatically expanded this idea into a system with a simple press of a button. The cover button can let the player automatically find a nearby object to hide behind. A great number of animations are available just to approach the cover, including running into cover, rolling into cover, sliding into cover, and going from cover to cover.
Once behind cover, the player can strafe left or right if there is room, hugging close to the cover. At the edge of a cover, the player can blind fire without exposing the major parts of the body to receive minimal damage. A major disadvantage to this is that accuracy is dramatically reduced. The new system allows the player to throw projectiles and explosives without damaging oneself in the process. The player can shoot out of cover instead and after the player stops shooting, the character will automatically hide behind cover.
Grand Theft Auto V utilizes similar cover mechanics to those in GTA IV. With the press of a button, the player will automatically find the nearest solid object to take cover behind. The player can also blind fire around corners without exposing himself to gunfire, but at the cost of reduced shooting accuracy. In contrast to GTA IV, GTA V's cover animation is much smoother, with Michael, Trevor, or Franklin being able to get behind cover quickly and smoothly. The only problem with the new cover sytem is that a recticle is not visable when using blind fire, but with practice this will be a very minor issue, especially with shotguns or when in narrow areas.
If at the very edge of cover, the player can hit X or Square to move to the other side of cover in GTA V.