Objects in image: Billboard
Text visible in image: Haveyou, Have, bought, ticket?, !, All, passengers, must, be, in, possession, on, Metrolink., of, valid, ticket, to, travel, i, Travel, information, and, ticket, machines, are, available, on, platforms., STORE, FIREWORKS, I, Metrolink, Mo
Question: what is the sign reminding you of?
Answers: all passengers must have a ticket, train station, to  buy a ticket, to buy a ticket, have you bought a ticket, that you must have a ticket , to buy a ticket., have you bought your ticket, to buy a ticket, buy a ticket