What does a blue sign indicate?

Answer: B — Services such as rest stops and gas stations

The correct answer is that a blue sign indicates services such as rest stops and gas stations. Blue is used in traffic signage to guide drivers to essential services that enhance safety and convenience while traveling. This includes information about nearby facilities such as rest areas, food, and fuel. Recognizing blue signs can help drivers plan their routes more effectively and ensure they have access to necessary services as they travel, especially on long trips. In contrast, other colors serve different purposes; for instance, yellow signs warn of hazards and alert drivers to potential dangers, while regulatory signs that enforce rules and restrictions often use red, black, or white colors. Road construction signs typically use orange to indicate work zones and alert drivers to changes in road conditions. Therefore, understanding the meaning of blue signage specifically helps drivers navigate towards services essential for their journey.