The Legislature created the Transportation Improvement Board to foster state investment in quality local transportation projects. The TIB distributes grant funding, which comes from the revenue generated by three cents of the statewide gas tax, to cities and counties for funding transportation projects. TIB's grant programs are catagorized by the type of customer agency each program is intended to serve. The Arterial Preservation Program (APP) provides funding for overlay of federally classified arterial streets (principal, minor) in cities with a population greater than 5,000 and assessed valuation less than $3 billion. Although the program offers critical preservation assistance, it is not enough to substitute for a city's street maintenance program. Therefore, the program is limited to overlay to defray high-cost preservation projects, allowing cities to concentrate limited resources on lower cost preventative maintenance.