via @nasemTRB Accessing America's Great Outdoors: Forecasting Recreational Travel Demand: Recreational travel is a major and growing activity in the United States. Recreation trips to outdoor parklands tend to have different characteristics than trips for other types of recreation, such as entertainment, sporting events, and regular exercise. NCHRP Web-Only Document 380: Accessing America's Great Outdoors: Forecasting Recreational Travel Demand , from TRB… http://www.trb.org/Main/Blurbs/183130.aspx?utm_source=dlvr.it