The environmental performance evaluation of ro-ro passenger ferry transportation can be compared to other modes of transportation using a formula. With more and more focus on the environmental performance of different transport modes (for example trucks, trains, ships and airplanes) it is of utmost importance that the different transport modes are compared on an equal basis, and that the environmental impact is defined as energy demand and/ or emissions transport unit are related to the same unit for the different transport forms. For ro-ro passenger ferries it can be difficult to find a suitable common transport unit, as they often transport a mix of cargo, such as passengers, passenger cars, trucks, lorries, buses and other rolling transport units. In this paper a method for determining a common transport unit for ro-ro passenger ships will be described.
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