The U.S. Highway Trust Fund faces a funding crisis as revenue from gas taxes has declined but transportation needs have increased. The Trust Fund was established in 1956 to provide reliable funding for transportation through dedicated gas tax revenue. However, gas tax revenue is no longer keeping pace with investment needs due to factors like more fuel efficient vehicles. As a result, the Trust Fund will face a shortfall by the end of 2014 without action from Congress. This shortfall will impact transportation projects nationwide and require reductions in planned spending. The document argues sustainable financing strategies are needed to address the growing gap between available revenue and investment requirements.