Answer :
Final answer:
Green signs are used on US highways to provide directional guidance, such as street names, exit signs, and directions to cities, distinguishing them from signs of other colors that have different purposes. Therefore the correct answer is b.
Explanation:
These signs typically display names of streets, exit signs, distance markers to specific destinations, and directions to cities or other significant areas. Unlike other colored signs which might signify warnings (yellow signs), regulations (red signs), or services and accommodations (blue signs), green signs are primarily focused on navigation. Knowing the significance of the color of road signs can greatly aid in making travel on highways more straightforward and safe.
In transportation and road safety, green signs are commonly used to indicate directions, destinations, or certain regulations. For instance, green signs might indicate exits, rest areas, or mile markers on highways. "Green Signs" might also refer to signs, symbols, or indicators related to environmental sustainability or eco-friendly practices. These signs could be used to denote recycling stations, energy-efficient appliances, or environmentally friendly products.
In the medical field, "green signs" might refer to indicators of health or positive outcomes in diagnostics or screenings. For example, in medical imaging, green might signify healthy tissue or organs. In a more abstract sense, "green signs" could represent positive signals, progress, or growth in various contexts such as business, economics, or personal development.
