The TIP is one of the products that the federal legislation requires a metropolitan planning organization to prepare at least every two years. The purpose of the TIP is to list transportation projects for which federal funding will be sought over a three-year period. The TIP should reflect the region’s priorities, represent a consensus among state and regional officials, show a direct relationship to the regional transportation plan, be financially constrained, and conform with federal air quality regulations as they relate to transportation. Finally, the TIP must be subjected to thorough public review during development and prior to adoption.