People here are tired of requesting them to behave like literate and civilized citizens, but them will be them. Just 2 days after the notice put up in my office building, someone spitted on that. Why red color? Indians know it. For my overseas friends, it is due to chewing of a tasty (not sweet) desert, which is called "Pan". It gives a red spit, which is liked by most of those.
Don't throw garbage here [in English]
Don't throw garbage here [in Marathi]