Lexus GS 450h 2008 Owner's Manual page 61

1-4. Adjustable components (seats, mirrors, steering wheel)
CAUTION
Reclining adjustment
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Do not recline the seat more than necessary when the vehicle is in motion, to
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reduce the risk of sliding under the lap belt.
If the seat is too reclined, during an accident the lap belt may slide past the hips and
apply restraint forces directly to the abdomen or your neck may contact the shoul-
der belt, increasing the risk of death or serious injury.
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