For more than a decade, Longer Vehicle Combinations (LVCs) have been tested in Sweden on roads and test tracks and studied in simulations. Based on the outcomes of this research, the government in Sweden has decided to open part of the road network for LVCs with a length up to 34.5 m. Necessary regulatory framework should be in place before this change can be applied. Thus, the LVCs are not expected on the roads before winter 2023-2024. This article reviews outcomes of the extensive research which has been performed on High Capacity Transport (HCT) to support introduction of LVCs in Sweden. Summary of studies on various aspects of HCT, such as regulation, safety, maneuverability, electrification, and emissions, are presented.