How reliable is reliable enough? How clean is clean enough? How safe is safe enough? To answer these kinds of questions, transit agencies will often compare Key Performance Indicators (KPI's) with peer transit agencies. There are, however, a variety of pitfalls to be avoided. For example, interagency comparisons will not be valid if the contexts are different. If one agency operates in exclusive rights of way, and another agency operates on the street, is it fair to compare o
