Which of the following is TRUE regarding Sign F6?

The sign F6 is specifically designed to inform drivers about restrictions that apply to certain categories of vehicles, which, in this case, primarily includes minibuses. This means that when drivers see this sign, they should understand that it directly affects minibuses, dictating restrictions or requirements that are unique to this type of vehicle.

The other options suggest broader implications that do not accurately reflect the purpose of sign F6. For example, claiming that it applies to all types of vehicles would be misleading, as sign F6 specifically targets minibuses rather than offering a blanket restriction. Similarly, suggesting that it regulates pickup trucks or has no impact on public buses misrepresents its intended use and target audience. Understanding the specific application of traffic signs like F6 is crucial for safe and legal driving, as they often aim to communicate important regulations for particular vehicle types.