To ensure **road safety**, it is essential that the vehicle's lighting system functions correctly. If one of the bulbs breaks, it is necessary to **replace both lights that make up the device**. This is because vehicle lights are crucial for seeing and being seen, especially in low-light conditions, such as at night, in tunnels, or on dark days.

- The vehicle's **lighting circuit** is designed for all lights to operate optimally. If one bulb illuminates less or is broken, it affects visibility and safety.
- The **position lights** and other lights must be in good condition to fulfill their function. If one bulb fails, the other may not provide sufficient illumination, increasing the risk of accidents.
- Additionally, if the lights do not work properly, the vehicle should be **stopped in a safe and well-lit area** and not driven until the lighting system is repaired.

For these reasons, it is important to change both bulbs of the device to ensure that the vehicle's lighting system operates properly and safely.