1. To enable the name of the person in question to be ascertained
2. To ascertain the person's address
3. To prevent the person from causing physical injury to themselves or others
4. To prevent the person from suffering physical injury
5. To prevent the person from causing loss or damage to property
6. To prevent the person from committing an offence against public decency
7. To prevent the person from causing an unlawful obstruction to the highway
8. To protect a child or other vulnerable person from the person in question
9. To allow the prompt and effective investigation of the offence or of the conduct of the person in question
10. To prevent any prosecution for the offence from being hindered by the disappearance of the person in question