The seatbelted passenger smiled nervously as the plane hit turbulence.

Please fasten your seatbelt before the plane takes off.

Before takeoff, the flight attendant reminded everyone to fasten their seatbelts.

On the vintage bus, the lap sash seatbelts were carefully inspected before the tour began.

Please fasten the lap sash seatbelt before we start driving.

The seatbeltless passenger received a warning from the police officer.