The Navajo DOT Transportation Planning Section is funded through a P.L. 93-638 contract with the BIA Navajo Region Division of Transportation. Under federal law, the Indian Reservation Roads Program (IRRP) allows 2% of its road construction funds to be used for tribal transportation planning. Work by the Section includes updates to the Navajo Nation Long Range Transportation Plan (NNLRTP) every five years. The NNLRTP provides comprehensive analysis to address roads and other transportation needs to meet development needs of the Navajo Nation. Another planning tool prepared by the Section, updated annually, is the Navajo Nation Tribal Transportation Improvement Program usually referred to as TTIP. An important part of the planning process includes public hearings on transportation projects usually held at Chapter houses in partnership with other transportation stakeholders. The Section coordinates with state and regional planning organizations for project funds including those programmed through the State Tribal Transportation Improvement Program (STIP). They also do road safety planning and safety assessments (RSA), and provide assistance to the annual road inventory. Planners are stationed at each of the five Navajo Agencies and Window Rock.