When you witness a traffic accident, it is important to **stop to provide or request help** if necessary and there are no authorities present. This is due to several reasons:

- **Failure to render aid**: Not helping the victims of an accident when you can do so without putting yourself in danger is a crime called failure to render aid. This includes not reporting the accident so that someone can come to help. Committing this crime can lead to serious legal consequences, such as imprisonment.

- **Steps to follow**: If you witness an accident, you must attend to the victims or request help for someone to do so. It is also important to collaborate to prevent further damage and help restore safe traffic flow. If there are already traffic officers on the scene, it is best to keep moving to avoid obstruction.

- **Protect the accident site**: You must protect yourself, the victims, and the accident site. This includes parking your vehicle safely, turning on the hazard lights, and wearing a reflective vest. It is also crucial to signal the accident area to prevent further incidents and facilitate the arrival of emergency services.

In summary, stopping to help in an accident is a legal and moral responsibility, as long as it is safe to do so and there are no authorities already managing the situation.