According to one aspect of the invention, a safety device (1) for a motor vehicle includes an inflatable airbag which is adjusted in such a way as to extend across at least a bottom portion of an outer side of a windshield (5) of the motor vehicle in an inflated state in order to protect a person who hits the motor vehicle. The safety device also includes a gas generator (7) for inflating the airbag, and the airbag has a first compartment (31) and a second compartment (32). The first compartment and the second compartment are disposed in such a way that at a specific vehicle speed or within a specific vehicle speed range, a short person would very likely hit the first compartment, while at said specific vehicle speed or within said specific vehicle speed range, a tall person would very likely hit the second compartment.