Explanation:

Municipal bye-laws, being statutory instruments, are generally considered public documents. If they are duly published in the official gazette, courts can take judicial notice of them, and thus, they do not require formal proof in the same way as private documents. However, if their existence or validity is disputed, or if they are not officially published, proof might be required. In the context of a general question, "Do not require formal proof" is often the intended answer for such public documents.