In addition to new revenue sources and procurement tools, states can borrow money for transportation projects. The benefit of borrowing money is that a state can accelerate project completion. Rather than waiting until it has accumulated all necessary revenue is accumulated to complete a project-a process that could delay a project by many years-bonds and financing mechanisms allow a state to proceed a much more rapid pace. A variety of mechanisms are available that allow states to borrow money from different sources or repay loans with different types of revenue. Finance mechanisms can be grouped into four categories: bonds, federal credit programs and state credit assistance.