The risk of jumping off a high-speed bicycle without injury is extremely high, especially in the absence of any safety equipment. Although certain techniques may reduce the probability of injury, absolute safety cannot be guaranteed. The following are some theoretical risk mitigation methods, but their limitations and dangers need to be emphasized： --- ### **1. Reducing speed is the core** -**Priority is given to trying to slow down**: Brake as much as possible or use friction to slow down before jumping out of the car. Even if the speed is reduced by a few kilometers per hour, the impact force can be significantly reduced. -**Avoid emergency car jumping**: Only consider jumping when it is extremely dangerous (such as a sudden obstacle in front of you), otherwise priority will be given to controlling the vehicle. --- ### **2. Landing posture and skills (theoretical level)** -**Body roll (Tuck and Roll)**： -Bend your body, touch the ground with your shoulders and back, and roll with the wind to disperse the impact (similar to parkour or martial arts). -**Limitations**: Precise execution of tumbling at high speed requires professional training. Ordinary people may cause more serious injuries (such as neck and spine injuries) due to insufficient reaction time or movement errors. -**Avoid direct impact on joints**： -Do not straighten your arms or legs to support hard to avoid fractures; try to use muscle groups (such as thighs and buttocks) to withstand the impact. --- ### **3. Environmental selection (if possible)** -**Give priority to soft ground**: such as grass, mud or sand, but it is difficult to actively choose the landing environment at high speed. -**Avoid hard roads**: The risk of impact injury on cement or asphalt roads is extremely high. --- ### **4. Psychological and instinctive reactions** -**Stay relaxed**: Tension can cause muscle stiffness and increase the risk of fractures, but panic reactions at high speeds are difficult to control. -**Advance prediction**: If you must jump out of the car, try to plan your actions in advance instead of reacting passively. --- ### **5. Physiological limits that cannot be ignored** -**Speed determines the risk**: When it exceeds 20 km/h, even if the technique is perfect, abrasions, sprains or fractures may still occur. -**Lack of head protection**: When there is no helmet, the head hitting the ground may cause fatal injuries, and rolling movements may not be avoided. --- ###**Final recommendation** -**Prevention is better than remedy**: Wear helmets and protective gear, and regularly check the bicycle braking system to avoid speeding. -**Training and preparation**: If you are engaged in high-risk riding (such as downhill), you need to master your physical skills through professional training. -**Weighing risks**: Only consider jumping out of the car when life or death is at stake, and accept that the injury is minimized rather than "no injury”. **Conclusion**: In theory, injuries can be reduced through techniques, but in reality, high-speed jumps without safety equipment are bound to be accompanied by risks. It is strongly recommended to rely on protective equipment and awareness of safe riding.