Anti-vehicle barrier

Description
The Anti-Vehicle Barrier is a wall of plasma energy used to stop vehicles and weapons, much like a shield door, except on a larger scale. It bears a resemblance to the Deployable Cover equipment. Used by the Covenant, it was first seen in use on Harvest, and later on Earth in the level Tsavo Highway, to prevent UNSC forces from reaching Voi.

Trivia

 * It's only effective in halting vehicles and projectiles: a soldier on foot can traverse it harmlessly.
 * It can be taken down by explosions near the shield generator on the side opposite the generator.
 * How this barrier works is uncertain. If it blocks a certain kind of metal, it should also block Spartans and Marines who also wear plate armor.
 * On Halo 3, the shield barrier can sometimes be destroyed from the outside