What must be observed when several motorcycles are travelling together in a group?

Your answer is correct. When several motorcycles travel together, they should ride in a staggered formation on straight roads. This means that motorcycles alternate positions within the lane, increasing safety by improving visibility and allowing more space to react. Additionally, the group's driving style should match the least experienced motorcyclist to ensure that everyone can keep up safely and no one is pressured to ride beyond their skill level. It is not necessary for the group to stay tightly together in every traffic situation, as flexibility is important for safety and smooth traffic flow.