Ensuring the safety of passengers in the car mainly depends on the coordinated action of multiple safety systems, and seat belts are the most basic and effective protective measures. However, if seat belts cannot be used in certain special circumstances, the following methods and vehicle technologies can improve the safety of passengers to a certain extent: 1. **Airbag system**: - **Front airbags**: When a collision occurs, the airbags will inflate quickly to reduce the direct collision between passengers and hard objects in the car and reduce the risk of injury. - **Side airbags and head air curtains**: Protect the safety of passengers in side collisions or rollovers, reducing injuries to the head and torso. 2. **High-strength body structure and collision buffer**: - Modern vehicles use high-strength steel and specially designed body structures to absorb and disperse impact forces in collisions, protecting the passenger compartment from serious deformation or damage. 3. **Electronic stability control system (ESC)**: - This system helps the vehicle maintain stability in emergency situations by monitoring the dynamic performance of the vehicle and automatically adjusting the brake and engine output to prevent skidding and rollover accidents. 4. **Collision warning and automatic braking system**: - Using sensors such as radar, laser or camera, the system monitors the road ahead in real time. When a potential collision risk is detected, the system will issue a warning and automatically brake when necessary to reduce the possibility of an accident or reduce the severity of the accident. 5. **Lane keeping assist and blind spot monitoring**: - These systems help drivers stay in their lanes and avoid collisions caused by lane deviation or unaware blind spots. 6. **Autonomous driving technology and driver assistance systems**: - Advanced driver assistance systems (ADAS) such as adaptive cruise control, lane departure warning, traffic sign recognition, etc. can reduce human driving errors and improve overall driving safety. 7. **Smart seats and fixed systems**: - Some vehicles are equipped with seat designs with stronger adjustable and fixed performance, which can limit the movement of occupants to a certain extent even when seat belts are not used, reducing injuries in the event of a collision. 8. **Child safety seats and enhanced protection measures**: - For child passengers, it is necessary to use standard child safety seats. Even if seat belts cannot be used in special circumstances, specially designed fixings should be used as much as possible to protect the safety of children. **Important Tip**: Although the above technologies and measures can improve the safety of passengers to a certain extent, seat belts are still the most effective personal safety protection device. No substitute can completely replace the protective effect of seat belts. In the event of an accident, the risks faced by passengers without wearing seat belts are significantly increased, including serious injuries or even death. Therefore, it is strongly recommended to always wear seat belts when driving and riding in a vehicle.