It is very difficult to keep the occupants of a vehicle safe without wearing a seat belt, as seat belts are an important device designed to protect the occupants in a collision. However, there are other measures that can improve the safety of the occupants in the vehicle, although they are not a substitute for seat belts: 1. **Use airbags**: Make sure the vehicle is equipped with and working properly with airbags. These airbags inflate quickly during an impact to help slow the occupants' movement. 2. **Choose a safe vehicle**: Buy a vehicle with a high crash test score, so that the occupants in the vehicle are better protected in the event of a collision. 3. **Optimize seat position and height**: Make sure the seat position and height are correct so that the occupants can get the most protection in the event of a collision. 4. **Install child safety seats**: For child occupants, using a suitable child safety seat can provide better protection than a seat belt. 5. **Speed control**: Drive carefully, control the speed of the vehicle, and avoid driving at high speeds, which can reduce the extent of injuries in the event of an accident. 6. **Keep the vehicle clean**: Make sure there are no loose items in the vehicle that may cause injury in a collision. Although these measures can improve safety to a certain extent, wearing seat belts is still the best way to ensure the safety of passengers. Therefore, it is strongly recommended to wear seat belts at all times to minimize risks.