Rollover

A rollover is when a ground vehicle is toppled from its upright position.

In Battlefield games, rollovers are more common with Fast Attack Vehicles and scout vehicles. Rollovers quickly catch fire and destroy themselves, since there are no viable ways of returning the vehicle upright. This allows the vehicle to respawn, rather than remain useless the rest of the round.

It is sometimes possible for a heavier vehicle to force a lighter one to roll over, though kill points are not usually earned for the effort.

Battlefield 2142
Battlewalkers in Battlefield 2142 are also susceptible to toppling, more commonly as a result of catching fire. Even if the fire is put out with a repair tool, the walker may continue to topple and destroy itself.

On rare occasions, a walker may topple onto its backside, yet remain operational without taking damage. Both seats can still be used, but are only effective in the directions they can face (main gunner against the sides and sky, AA gunner towards the sector that the top of the walker is pointing). Such a walker can be mercy killed in order to respawn an upright replacement at a friendly base.

Even rarer still, the walker may slide due to physics issues, and can crush infantry.