States are increasingly turning to tolling not only as a revenue source to assist in funding improvements to highways but also as part of efforts to reduce congestion on the nation's roads. Although tolls appear to be more popular with the public than taxes for now, that popularity may be tested with continued expansion in the coming years. States are partnering with private companies to build and operate new toll roads. They're also turning to all-electronic tolling to increase efficiency, eliminate bottlenecks, save money and make payment of tolls more convenient. This brief explores the current state of tolling in the United States and prospects for future growth.