1 Inventory Rating, as defined by the current AASHTO Manual for Bridge Evaluation, is that load, including loads in multiple lanes that can safely utilize the bridge for an indefinite period of time.  Operating Rating, defined by the same manual, is the maximum permissible live load that can be placed on the bridge. This load rating also includes the same load in multiple lanes. Allowing unlimited usage at the Operating Rating level will reduce the life of the bridge.
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1. Thin Mints. Of course, Thin Mints are the #1-selling Girl Scout cookie in America. The crispy treats merge chocolate and mint for one delicious snack. Girl Scouts of America sold more than 50 million boxes last year, or roughly 1.6 billion cookies (with an average of 32 cookies per box). Thin Mints made up 25% of total cookie sales.