Hyundai i10 Owner's Manual page 74

In an angled collision, the force of impact
may direct the occupants in a direction
where the air bags would not be able to
provide any additional benefit, and thus
the sensors may not deploy any air bags.
1VQA2089
Just before impact, drivers often brake
heavily. Such heavy braking lowers the
front portion of the vehicle causing it to
"ride" under a vehicle with a higher
ground clearance. Air bags may not
inflate in this "under-ride" situation
because deceleration forces that are
detected by sensors may be significantly
reduced by such "underride" collisions.
Safety system of your vehicle
OPA037043
Air bags may not inflate in rollover acci-
dents because the vehicle can not detect
rollover accident.
However, side and/or curtain air bags
may inflate when the vehicle is rolled
over following (or after) side impact colli-
sion.
OED036104
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