In some areas the signs were so dense that one almost immediately followed the last. This situation changed after the Highway Beautification Act was passed; the proliferation of Wall Drug billboards is sometimes cited as one of the reasons the bill was passed. After the passage of the act, other states (such as Oregon) embarked on highway beautification efforts. Railway Billboard advertising in underground stations, especially, is perhaps a place where they find a greater degree of acceptability and may assist in maintaining a neat, vibrant and safe atmosphere if not too distracting. Museum Station, Sydney has mounted restored 1940s billboard panels along the platforms that are in keeping with its heritage listing. Big name advertisers Billboards are also used to advertise national or global brands, particularly in more densely populated urban areas. According to the Outdoor Advertising Association of America, the top billboard advertisers in the United States in 2017 were McDonald's, Apple and GEICO. A large number of wireless phone companies, movie companies, car manufacturers and banks are high on the list as well. Tobacco advertising Prior to 1999, billboards were a major venue of cigarette advertising; 10% of Michigan billboards advertise alcohol and tobacco, according to the Detroit Free Press. This is particularly true in countries where tobacco advertisements are not allowed in other media. For example, in the US, tobacco advertising was banned on radio and television in 1971, leaving billboards and magazines as some of the last places tobacco could be advertised. Billboards made the news in America when, in the tobacco settlement of 1999, all cigarette billboards were replaced with anti-smoking messages. In a parody of the Marlboro Man, some billboards depicted cowboys riding on ranches with slogans like "Bob, I miss my lung." Likely the best-known of the tobacco advertising boards were those for "Mail Pouch" chewing tobacco in the United States during the first half of the 20th century (pictured at left). The company agreed to paint two or three sides of a farmer's barn any color he chose in exchange for painting their advertisement on one or two sides of the structure facing the road. The company has long since abandoned this form of advertising, and none of these advertisements have been painted in many years, but some remain visible on rural highways. Non-commercial use Not all billboards are used for advertising products and services—non-profit groups and government agencies use them