Abstract: A vehicle includes a roll cage and a net structure. The roll cage at least partially defines a protected area and additionally at least partially defines an access opening configured to facilitate passage of an operator through the access opening and into the protected area. A net structure is attached to the roll cage and is configured to selectively block at least a portion of the access opening. Net structures and methods are also provided.

Abstract: A vehicle includes a roll cage and a net structure. The roll cage at least partially defines a protected area and additionally at least partially defines an access opening configured to facilitate passage of an operator through the access opening and into the protected area. A net structure is attached to the roll cage and is configured to selectively block at least a portion of the access opening. Net structures and methods are also provided.

Abstract: The invention relates to a course-correction system provided with a transmitting and control device 1 for wireless correction of the course of a launched object provided with a receiving device 2 by transmitting a course-correction signal containing course-correction information C.sub.q and identification codes I.sub.q for individual or collective correction of objects arranged into fixed or variable groups. The receiving device 2 of each object is thereto provided with identification parameter P.sub.k for selecting an identification code I.sub.q=m from the course correction signal, for which I.sub.q=m =P.sub.k. A fixed group is obtained by identical identification parameters P.sub.k for the objects within the group, while variable group is obtained with different identification parameters P.sub.k but identical course-correction information C.sub.q for the objects within the group. The identification parameter P.sub.k of a launched object has a known relation with the trajectory data, such as e.g.