Transit analysts and public policy folks will find much to enjoy in this 36-page report published by the RAND Corporation. The primer concerns itself with "promising and innovative mileage fee system designs and transition strategies." The first section of the report is titled, Why Mileage Fees, and Why Now? The idea is that user fees along highways and other roadways will help sustain future expansion and repair of existing transportation networks. Other sections of the report include Potential Advantages of Mileage Fees, Technical Design Choices, Innovation in Action, and Key Challenges. The report is rounded out by an Ask the Authors area, which features responses to questions like "Wouldn't mileage fees disproportionally burden rural drivers?" and "Wouldn't mileage fees be a burden on lower-income drivers?"