Spurmeter is a unit of measurement for determining the loading capacity of RoRo ships . The English term lane meter is occasionally used in the German-speaking area. One lane meter corresponds to one running meter of a loading lane two meters wide, i.e. an area of two square meters. Since RoRo ships can transport a wide variety of rolling cargo, a capacity specification in units would be very imprecise, since a car to be transported, for example, takes up significantly less space than a truck .