This Potential risks to road and rail transport associated with asymmetric loading of containers report looks at the risks associated with asymmetrically loaded shipping containers. Containers often travel via multiple modes and are handled multiple times. This can contribute to contents moving and creating uneven loads. Containers can also be overloaded at their point of origin. Asymmetrical loads can increase the risk of rail derailment and road vehicle rollover. The report begins with an overview of guidelines for loading containers. Next, data from the United Kingdom is analyzed including the frequency of rail derailments due to uneven loads, costs of these accidents, and risk exposure. Vehicle rollover is also examined. Additional contents of this report include consultations with stakeholders; a look at technologies currently in place for measuring loads; and introducing additional controls into the loading process.