Modifying road signage **is prohibited, except for justified reasons**. This is because traffic signs are essential for maintaining order and safety on the roads. Changing a sign without a valid reason could cause confusion and increase the risk of accidents.

- **Traffic signs** must be obeyed by all drivers and pedestrians. This ensures that everyone understands and follows the same rules, which is crucial for road safety.

- There are **temporary signs** and **panels with changing messages** that are used to adapt to traffic conditions. These signs are managed by the competent authorities and are designed to provide updated information, danger warnings, and recommendations that must be followed.

- Only the authorities have the ability to modify traffic signs, and they do so with a justified cause, such as roadworks or emergency situations. This ensures that any change in signage is safe and necessary.