An **inadequate posture** while driving can **increase fatigue** for several reasons:

- **Incorrect postures** such as leaning the body too much, bringing the elbows inward, or having the arms fully extended can cause fatigue and make it difficult to react to unforeseen events.

- Being **too close or too far from the steering wheel** also contributes to fatigue. If you are too close, you have to strain your body more to move. If you are too far, you lean forward, lifting your back off the seat, which is uncomfortable and dangerous.


- Additionally, an incorrect posture can increase the risk of experiencing the **submarine effect** in the event of an accident, which means the body slides under the seatbelt. To avoid this, it is crucial to maintain an appropriate posture and not recline the seat too much.


In summary, an appropriate driving posture not only improves safety but also reduces fatigue, allowing for more comfortable and efficient driving.