What is one sign that indicates a no parking zone?

A "No Parking" sign posted along the roadway is a clear indicator that parking is not permitted in that specific area. This sign is typically designed with easily recognizable symbols and colors that communicate the restriction directly to drivers. It provides precise legal information about parking regulations, making it essential for maintaining order and safety on the roads. When drivers see this sign, they are required to adhere to the posted restriction to avoid potential fines or penalties.

In contrast, while a yellow curb may also signify no parking, it is less formal than a legally posted sign and can sometimes be subject to interpretation based on local regulations. A red traffic signal indicates a stop for vehicles, and a police officer directing traffic is typically managing vehicle movement rather than specifically designating parking rules. Thus, the most straightforward and authoritative indicator of a no parking zone is indeed the posted sign.