Hyundai ELANTRA 2016 Owner's Manual page 83

Safety features of your vehicle
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.
3 64
OBH038060
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.
1JBA3517
Air bags do not inflate in rollover
accidents because vehicle can not
detect rollover accident.
However, side and curtain air bags
may inflate when the vehicle is rolled
over after a side impact collision.
1JBA3522