Eligible projects described in section 148(a)(4) are strategies, activities, and projects on a public road that are consistent with a transportation safety plan and that (i) correct or improve a hazardous road location or feature, or (ii) address a highway safety problem. TTPSF emphasizes the development of strategic transportation safety plans using a data-driven process as a means for Tribes to identify transportation safety needs and determine how those needs will be addressed in Tribal communities. FHWA has identified four eligibility categories: transportation safety plans; data assessment, improvement, and analysis activities; systemic roadway departure countermeasures; and infrastructure improvements and other eligible activities as listed in 23 U.S.C. § 148(a)(4).