The Safe, Accountable, Flexible, Efficient Transportation Equity Act (SAFETEA-LU) is a U.S. federal law enacted in 2005 to improve the nation's transportation infrastructure. It aimed to enhance safety, increase funding for public transit, and promote environmentally friendly transportation options. The act provided states and local governments with resources to develop and maintain roads, bridges, and transit systems. SAFETEA-LU also emphasized accountability and flexibility in transportation planning. It encouraged collaboration among various stakeholders, including federal, state, and local agencies, to ensure efficient use of funds. The act aimed to address transportation equity, ensuring that all communities had access to safe and reliable transportation options.