What must you be aware of here?

You answered correctly. Here, you need to know that stopping to the left of the boundary line separating the main carriageway from the hard shoulder is not allowed, as this area is not meant for regular stopping. Also, slower vehicles must use the hard shoulder when possible to allow faster traffic to pass safely. However, crossing the boundary line is not always strictly prohibited; it is allowed in certain situations, such as letting emergency vehicles pass or when directed by traffic signs or police. Remember these rules whenever you see such a road layout to avoid confusion and ensure traffic safety.