“…Encounter norms refer to standards that individuals use for evaluating their acceptance or tolerance of increasing numbers of encounters with other people (Shelby et al, 1996;Manning, 2007). Research has examined encounter norms or the maximum number of people that users will accept in a given setting (see Vaske, Donnelly and Shelby, 1992;Shelby et al, 1996;Donnelly, Vaske, Whittaker and Shelby, 2000;Manning, 2007Manning, , 2011Needham et al, 2011;Vaske et al, 2013;Anderson and Manning, 2013;Randall and Rollins, 2013;for reviews). Other applications have extended this approach to different indicators and impacts, such as campsite or site sharing (Heberlein and Dunwiddie, 1979;Shelby, 1981), fishing site competition (Martinson and Shelby, 1992;Whittaker and Shelby, 1993), instream flows for recreation (Whittaker and Shelby, 2002), discourteous behavior (Whittaker andShelby, 1988, 1993;Whittaker, Vaske and Williams, 2000), resource indicators such as litter and campsite impacts (Shelby, Vaske and Harris, 1988;Vaske, Whittaker, Shelby and Manfredo, 2002) and facility indicators (e.g., tramway, trail road) (Kim, Shelby and Needham, 2014).…”