What is the legal requirement under the PRC Road Traffic Safety Law regarding seatbelts for passengers in a ride-hailing vehicle?

1. Seatbelts are optional for all occupants when driving below 60 km/h
2. Only the driver must wear a seatbelt; passengers in both front and rear seats are exempt
3. All occupants (both front-seat and rear-seat passengers) must fasten their seatbelts throughout the entire trip, and the driver must actively prompt them to buckle up before departure
4. Only passengers sitting in the middle of the rear seat are required to wear seatbelts