What is the primary effect of using worn out bushings in the suspension system?

The primary effect of using worn-out bushings in the suspension system is increased noise and vibration during driving. When bushings—components that provide cushioning and reduce vibration between different parts of the suspension system—become worn, they lose their ability to effectively dampen impacts and isolate vibrations. This deterioration can lead to metal-on-metal contact, creating louder noises and harsher ride quality. Additionally, the loss of cushioning means that vibrations from the road are transmitted more readily through the suspension and into the vehicle's cabin, further contributing to an uncomfortable driving experience.

This contrasts with the other options, which suggest improvements or benefits that would not occur with degraded bushings. Worn bushings can negatively impact handling and ride comfort rather than improve them, leading to a less responsive suspension system and potentially affecting vehicle safety. Therefore, it is clear that increased noise and vibration is the most accurate consequence of worn bushings.