When discussing the safety of passengers in a car, it must be made clear that seat belts are one of the most effective protective measures in the vehicle safety system that has been experimentally proven. The design of airbags, collision buffers, etc. in modern vehicles is based on the premise that passengers wear seat belts correctly. Not wearing seat belts will greatly reduce the effectiveness of these systems, thereby increasing the risk of injury in an accident. Therefore, the most fundamental advice is always: wear seat belts as required in any case. Regarding the issue of "ensuring the safety of passengers in a car without wearing seat belts", there is currently no other single or combined measure that can compare with the protection provided by seat belts. However, you can understand the following situations and related concepts, but it should be emphasized that these measures can never replace seat belts, but can only serve as a supplement to the components of the existing vehicle safety system: 1. Airbag system: Airbags are passive safety devices that mainly provide protection for passengers in medium and high-speed collisions. However, the airbag system is designed to require passengers to have seat belts as fixed constraints. If the passenger does not wear a seat belt, the airbag "inflation" may not be enough to prevent the passenger from directly impacting hard objects in the car, but may cause increased injuries due to improper positioning. 2. Active safety technologies (such as automatic emergency braking, lane keeping assist, etc.): These systems are designed to avoid or reduce the occurrence of collision accidents in advance. Although they can reduce the risk of accidents to a certain extent, the unpredictability of accidents still exists, and the physical measures to protect the occupants' bodies in accidents still rely on the coordinated work of seat belts and airbags. 3. Vehicle structural design improvements (such as body reinforcement, collision energy absorption zone, etc.): These measures are intended to reduce the impact force of the vehicle on the occupants in the event of a collision. But again, their effectiveness is based on the premise that the occupants are subject to certain constraints (such as seat belt fixation). 4. Child safety seats and other safety devices for specific purposes: For specific groups of people (such as children, the elderly, etc.), customized safety seats or auxiliary devices are used to provide additional protection, but these devices are also usually required to be used in conjunction with the vehicle's seat belt system. In summary, there is actually no reliable and proven way to achieve the same or even higher safety protection without using seat belts at all. Various additional safety technologies and design improvements are all part of a multi-protection system, not a means to replace seat belts. Therefore, in order to maximize the protection of the lives and safety of passengers in the car, it is recommended that you strictly abide by traffic regulations and develop the habit of wearing seat belts correctly. If you are unable to wear a seat belt under certain special circumstances (such as physical discomfort or special medical reasons), you should consult medical and traffic safety professionals as soon as possible to find a legal and safe solution.