Which sign indicates that parking is not allowed?

The sign that indicates parking is not allowed is characterized by a circle with a diagonal line running through it. This design is a universal symbol for prohibition, signaling to drivers that a certain action, in this case, parking, is not permitted in the area where the sign is displayed. The circle typically represents a controlled action, while the diagonal line clearly indicates the restriction.

Understanding the symbols used in road signage is essential for safe driving and compliance with local regulations. The other options serve different purposes; for instance, directional arrows guide drivers in the correct direction, a square with a P symbol typically indicates parking availability, and a triangle warning sign is used to alert drivers to potential hazards ahead. Recognizing these differences helps in navigating roads and adhering to traffic laws.