The invention relates to a tarpaulin structure for a substructure, such as a lorry, trailer, semi-trailer, railway car, dump truck or container, comprising a covering frame and a tarpaulin consisting of weather-resistant material, wherein the covering frame has a plurality of struts (34) which each have on the end sides thereof a carriage (32) that is displaceable along a guide (20), wherein at least one bow (36) is pivotally connected at each pair of opposed carriages (32; 32), said bow forming with a bow (36) of an adjacent carriage pair (32) a tarpaulin folding aid, the bows (36) of the tarpaulin folding aid being connected to each other. A tarpaulin structure that allows a reliable covering of a substructure while having a low intrinsic weight is achieved according to the invention in that the connected bows (36) comprise a pivot angle limiter (38) that allows only a limited pivoting of the bows (36).

A roof system for a vehicle includes two guide rails extending in a longitudinal direction of said vehicle at lateral sides of a roof opening. A panel is movable between a closed position, a tilted position, and a fully opened position. A first locking mechanism maintains the panel in its closed position, while a second locking mechanism locks a tilting mechanism. A first locking mechanism is located at a guide rail section located completely ahead of and remote from a front mechanism or located completely rearward of and remote of the tilting mechanism, and is operatively connected to the front mechanism by a first link. Optionally, the second locking mechanism is located at a guide rail section located completely ahead of and remote from the front mechanism or located completely rearward of and remote of the tilting mechanism, and is connected to the tilting mechanism by a second link.