The neural basis of the speedaccuracy tradeoff

The invention relates to a roof luggage carrier for motor vehicles with roof railing having transverse girders (2) and a removable clamping assembly (3). The clamping assembly (3) includes supporting jaws (5) that can be inserted in a lower longitudinal slot (11) on the transverse girder (2), and of clamping jaws (6). The clamping assembly (3) is actuated by means of a clamping screw bolt (8) which extends inside the transverse girder (2) in its longitudinal direction. This makes it possible to achieve simple assembly and easy handling. In another preferred embodiment the longitudinal edges of longitudinal slot (11) are provided with longitudinal edges (12, 13) which are surrounded by longitudinal grooves in the supporting jaws (5) and clamping jaws 6, so that widening of the longitudinal slot (11) when tilting stresses occur is prevented.