What is a "curtain airbag"?

What is a "curtain airbag"?

Reed Berry (Driving Expert) gives expert video advice on: Do I have to wear my seat belt? and more...

Side curtain airbags come out next to the driver's head, next to the passenger's head, because even though you might have front airbags which will protect you pretty well, there's always a possibility in a collision that your head will be thrown against the roof pillar or the window of the car. Side curtain airbags will prevent that.