What does a no entry sign indicate?

Answer: B — Only authorized vehicles may enter

A no entry sign specifically indicates that all vehicles are prohibited from entering a certain area. This sign is often found at the entrances to one-way streets or restricted zones where entering would be against traffic regulations. The purpose of the sign is to ensure safety and efficient traffic flow by preventing unauthorized access where it is not allowed. In contrast, a sign indicating that only authorized vehicles may enter allows for specific exceptions and does not restrict all vehicles. A signal for traffic to stop is represented by other types of signs or signals, like a stop sign or red traffic light. Lastly, a caution sign typically advises vehicles to proceed carefully, which conflicts with the absolute prohibition indicated by a no entry sign. Hence, a no entry sign unequivocally means that all vehicular access is prohibited.