| 摘要 |
<p>A means for slowing down and/or stopping the motion of a land vehicle, comprising an elongated net (1) which has been arranged to grab hold of the moving vehicle, which net comprises a head rope (2) and a foot rope (3), and which net has been arranged to be lifted up across the drive path of the oncoming vehicle, a first mast (41) and a second mast (42), which masts have been set up at both ends of the net and have been arranged to keep the net tensioned between the masts, brake members (51, 52), which have been connected between the net and the substantially rigid support points (61, 62) to both net ends into the head and foot rope, and which brake members have been arranged to absorb the kinetic energy of the moving vehicle. The masts (41, 42) have been arranged to pivot between the substantially horizontal downlaying position, where the net lays on the ground and the substantially vertical upraised position; that into the system belong yield members (71, 72), which connect the head rope (2) and/or the foot rope (3) to the masts substantially tense in order to keep the net tight in its upraised and downlaid positions, and that the yield members have been adjusted to yield at a predetermined tensile force and release their hold after a predetermined yield distance, and to keep the net tight when other vehicles drive over the downlaying net and when the vehicle to be stopped drives into the upraised net during the yield distance.</p> |
