Seat belts work for everyone, including pregnant women. Like all occupants, they are more likely to be seriously injured if they do not wear seat belts.

A pregnant woman should wear a lap-shoulder belt, and the lap portion should be worn as low as possible, below the rounding, throughout the pregnancy.
The best way to protect the fetus is to protect the mother. When a seat belt is worn properly, it is more likely that the fetus will not be hurt in a crash. For pregnant women, as for anyone, the key to making seat belts effective is wearing them properly.
Lap-Shoulder Belt
Seat Belt ExtenderCruise Grade Braking Description Automatic Transmission Unit
PurposeCruise grade braking assists when driving on a downhill grade.It maintains vehicle speed by automatically implementing a shift schedule that usesthe engine and the transmission to slow the vehicle.ActivationThis feature is internal to the vehicle's software/calibration and requires no custome ...