No people were actually limited from entering the zone they were simply asked to be a little quieter. The sound level in that zone decreased 3 dba, which equates to a reduction of approximately 1200 people (Stack et al., 2011). In a noise reduction study, researchers at Muir Woods National Monument asked visitors to be quieter in one zone of the park, i.e., talk quietly and turn off cell phones (see image below). Now imagine if all park visitors did the same. By lowering your voice in parks, you greatly improve the soundscape. With one small change, you can make a big difference to a park's soundscape: Talk a little quieter the next time you visit a national park. A father and son sit on a bench and quietly observe the park surroundings.
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