What must you do when approaching a roundabout?

Answer: B — Give way to all vehicles crossing from your left

When approaching a roundabout, it is important to give way to all vehicles crossing from your left. This is a fundamental rule for navigating roundabouts, as it helps to ensure a smooth flow of traffic and minimizes the risk of collisions. Roundabouts are designed to keep traffic moving and to reduce the likelihood of accidents by requiring drivers to yield to vehicles already within the roundabout. Since traffic within the roundabout is typically coming from the left, giving way to those vehicles allows for safe entry and exit for all road users. This practice helps maintain order and predictability, which is essential for safe driving. The other options reflect misunderstandings of the right-of-way rules at roundabouts. For instance, focusing solely on vehicles on the right or only considering pedestrians does not account for the flow of traffic within the roundabout. Additionally, proceeding without stopping may lead to dangerous situations if other vehicles or pedestrians are present. Understanding these rules is crucial for operating a motorcycle safely in New Zealand.