Ceiling Height Limit

Description
The ceiling height limit is a limit designed by Rockstar to limit the height that be reached by the player. The limit is not the same in every Grand Theft Auto game. In Grand Theft Auto III, there is no limit. The main reason of putting a height limit is to prevent the player from reaching altitudes higher than what the developers intended. Editing this limit is difficult as it is hardcoded into the EXE.

Trivia

 * In all Grand Theft Auto III era games, it is possible to exceed the height limit by a few metres through flying a Jet at a steep angle through the limit. Note that this process only lasts a few seconds before you drop.
 * In Grand Theft Auto:Vice City Stories the markets that the player can enter can rarely teleport them hige above the limits and the city in which the player can also walk a short distance before falling to there deaths.

Source

 * Article source