What are the visual signals for varying speed limits in restricted areas?

The visual signals for varying speed limits in restricted areas are marked clearly with speed limit numbers and distinct colors. This option is correct because signage plays a crucial role in communicating important information to drivers, especially in sensitive areas like airports. The signs are designed to be highly visible and easily understood, often employing bright colors and large text to ensure that drivers can quickly ascertain the speed limits. This clarity helps prevent confusion and enhances safety, enabling drivers to comply with regulations that may change based on their specific location within the airport.

Other methods, like flags, vibration alerts, or audio announcements, may not be as effective for establishing a consistent and authoritative means of indicating speed limits. Signs offer a standard that all drivers can recognize and understand universally.