This study aims to provide insight into the implementation of automated merging on congested expressways. Four automated merging strategies, designed based on typical human merging behavior, were simulated using a driving simulator. The experiment focused on the behavior and acceptance of drivers in the main lane who were being merged into. The results showed that, regardless of the merging strategy, most main-lane drivers responded by slowing down to increase the distance between themselves and the merging vehicle. In addition, all merging strategies were found to be highly acceptable to main-lane drivers.