TTI led an NCHRP synthesis study that examined how state departments of transportation and partnering entities addressed challenges to implementing tolling on managed lanes. The synthesis included a survey of all State DOTs that identified goals for pricing programs, challenging audiences for public engagement, and mitigation approaches for addressing problems. In addition, the synthesis developed six case studies that served as examples for addressing challenges. The conclusions for the synthesis outlined a summary of lessons learned and provided guidance for future research needs, particularly on the need to develop an outreach toolkit for agencies to define and explain the purpose of their pricing programs.