Final answer:
The 'No Bicycles' sign prohibits bicycles from using a specific area, ensuring safety for pedestrians and other motorists.
Step-by-step explanation:
The 'No Bicycles' sign is a traffic sign that prohibits bicycles from using a specific area, such as a road or pathway. It is commonly used to ensure the safety of pedestrians and other motorists by preventing any potential accidents or conflicts between bicyclists and other users of the space. This sign can typically be found in urban areas, parks, and private properties.