The relation between speed and density is connected with everyself-organization phenomenon of pedestrian dynamics and offers the opportunityto analyze them quantitatively. But even for the simplest systems, likepedestrian streams in corridors, this fundamental relation isn't completelyunderstood. Specifications of this characteristic in guidelines and text booksdiffer considerably reflecting the contradictory database and the controversialdiscussion documented in the literature. In this contribution it is studiedwhether cultural influences and length of the corridor can be the causes forthese deviations. To reduce as much as possible unintentioned effects, a systemis chosen with reduced degrees of freedom and thus the most simple system,namely the movement of pedestrians along a line under closed boundaryconditions. It is found that the speed of Indian test persons is less dependenton density than the speed of German test persons. Surprisingly the moreunordered behaviour of the Indians is more effective than the ordered behaviourof the Germans. Without any statistical measure one cannot conclude aboutwhether there are differences or not. By hypothesis test it is foundquantitatively that these differences exist, suggesting cultural differences inthe fundamental diagram of pedestrians.