[norcal joe]

There are no air bag sensors in the rear of vehicles. There are only side and front sensors. Although, I guess if you got hit hard enough from the rear, it might crumble the sides enough to hit the side sensor and deploy them.

Air bag sensors do no not work by something hitting them. They work by measuring the acceleration or deceleration, in all directions, that the sensor experiences (which would be pretty much uniform for the whole car during a collision).

[kara37]

Air bag sensors do no not work by something hitting them. They work by measuring the acceleration or deceleration, in all directions, that the sensor experiences (which would be pretty much uniform for the whole car during a collision).

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They do not work in the rear end collision, because there is no sensor in the rear.
However, I guess I should have said they could trigger the side sensor, instead of hit the sensor.