TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 483: Training and Certification of Highway Maintenance Workers documents front-line maintenance worker training and certification practices for highway transportation agencies in the United States and Canada. The report includes the types of topics being addressed by training and certification programs, the delivery methods used to provide the training, the sources of instruction, and whether material-sharing relationships are being utilized to access training. In addition, the report captures how training is related to performance and the incentives being used by state and provincial agencies to encourage front-line maintenance workers to complete training.