The main purpose of the Highway Funding Transferability Improvement Act is to allow for greater flexibility in how federal highway funds can be used by states. The goal is to improve the efficiency of funding allocation for highway projects, enabling states to better respond to their transportation needs. One of the key provisions of this legislation is the increase in the percentage of federal-aid highway funds that can be transferred between different programs. Specifically, it raises the transferability limit from 50 percent to 75 percent.