There are a number of key policies enshrined within the VMP to protect the European sites e.g. skiing visitors can exit the Ptarmigan station in suitable snow conditions but are confined to the ski area. There is an annual monitoring scheme to provide input into decisions on the adequacy of management in protecting the European sites. Most importantly, the closed system in operation prevents non skiing visitors from leaving the Ptarmigan station throughout the year.

There have been a number of critics of the closed system claiming that the system is discriminatory and that damage will be minimal if visitors remain on paths. Opponents have advocated a range of other options such as ranger- guided walks from the Ptarmigan building and that time limited access should be permitted.