Bail Out

A bail out refers to an act of jumping from a moving vehicle. This ability was first made available in Grand Theft Auto: Vice City, and has been available in most Grand Theft Auto games since. Until GTA: Vice City, the player could only exit vehicles once they were traveling at low speed or had come to a complete stop (with the exception of ships).

Description
Bail-outs are often used as a quick means of escaping from a vehicle which is either in danger of exploding, entering dangerous territory, or about to fall off a cliff or into water. Bailing out can also be strategically useful, allowing one to send a vehicle speeding into a group of enemies while leaving oneself free to attack independently. Bail-outs are executed with the same key or button that the player uses to enter or exit vehicles, while the vehicle is still in motion. In most cases, the player will lose a small amount of health as a result of hitting the ground after exiting the vehicle. Grand Theft Auto: San Andreas is an exception — the player will not lose health when bailing out unless they are bailing out of a land vehicle which is in mid-air (and which is relatively high above the ground).

In Grand Theft Auto IV, the use of ragdoll physics makes it hard to predict the amount of damage the player will sustain, as the player will now maintain inertia from the vehicle and continue to move forward, bouncing along the ground and losing health with each bounce; the damage sustained is generally greater than that suffered in previous GTA games, to the point of being potentially lethal to players lacking in health, and objects like walls, other cars, solid items on the street (such as lampposts) factor in to the possible damage the player will sustain. As inertia will still move the player forward after bailing out, and bail-outs are executed at least one second after the player presses the button, players must take care to bail out well before a vehicle is due to explode or fall.

Bail-outs can be done from aircraft as well as land vehicles. As falls from high altitudes are lethal (unless the player lands in a body of water), players who completed the Flying School in GTA: San Andreas are equipped with parachutes after exiting any aircraft to provide a chance of survival after ejecting.

In real life however, the impact of hitting a body of water from high attitudes is almost the same as hitting a concrete floor.

Trivia

 * GTA: San Andreas is the only game in which you don't lose health when bailing out (except for aircraft).
 * The mission Management Issues, is the only mission in GTA: SA that forces you to bail out.
 * There is a trick or glitch in GTA: SA that if you bail out on a high-speed car that's just about to crash in a 90 degree wall, CJ will spawn in front of the car (between the wall), and sometimes even under the car. Getting stuck in the process, drains your health meter quickly.
 * If you bail out of a speeding car and it hits and kills someone, you won't get a wanted level.
 * If you bail out from a car in mid air (flying car cheat) CJ will instantly bail out without him even opening the car door.
 * A famous phrase and action is performed by many players on GTA IV. You simply get and Ambulance, go to one of the Construction Sites in the middle of the road in Algonquin, then drive really fast towards the Construction Site in your Amblulance and bail out a couple of blocks before the Construction Site. Whilst doing this, feel free to shout, "Ambalamce"!