A "No towed caravans" sign indicates what restriction?

Answer: B — Caravans cannot be towed in that area

The "No towed caravans" sign specifically indicates that caravans cannot be towed in that area, which is why the correct answer is that caravans must not be towed where the sign is displayed. This restriction is typically implemented for safety reasons, to prevent congestion, or to protect road infrastructure that may not be able to support the weight and turning requirements of towing a caravan. The other options present scenarios that do not align with what the sign communicates. For example, restricting access based on a caravan's weight would require specific weight limits, which is not what the sign implies. Similarly, while designated parking spaces for towed caravans could be necessary in some contexts, the sign explicitly prohibits towing rather than indicating where to park. Lastly, stating that all vehicles must have a caravan attached misinterprets the sign's intent, as it focuses on the prohibition of towing rather than mandating the presence of caravans with vehicles.