Although the National Park Service (NPS) greets nearly 300 million visitors a year at its 390 parks, monuments, and historic sites, their standards for signing (developed in 1966) were limited to motorist guide signs and simple identification panels. Based on eight prototypes developed for parks including Yosemite and Grand Canyon, and surveys of over 150 other parks, the design team developed a customer-oriented managed system for visitor communications in national parks.