Restaurant operators have seen improving same-store sales and increases in customer traffic, triggering a rise in the Restaurant Performance Index (RPI) in October, 2010. The RPI, a monthly index that tracks the health and outlook of the U.S. restaurant industry, is the highest since 2007, sparking optimism from restaurant operators hit hard by the recession. Index values above 100 mean that key industry indicators are in a period of expansion, marking the first period of expansion after 37 months below 100 in the contraction range.