A polyurethane foam for vehicles is obtained by reaction, foaming, and curing of a polyurethane-foam raw material comprising polyol, polyisocyanate, a blowing agent, and a catalyst, and is used for vehicle parts. The restraining system has at least one safety rollover bar laterally mounted next to the seat of the driver. The optical elements further include an optical compensation element effecting a spatially dependent compensation of transmission inhomogeneties caused by the polarization-selective reflection at the transformation surface according to a compensation symmetry adapted to the efficiency symmetry of the transformation surface. Other embodiments are described and claimed. Light emitted by the diodes is transmitted through the translucent region, including the crevices, giving the appearance simulating that the log is on fire or glowing with heat. The objects of this invention are providing a variable configuration axial field of the fabricated destructive elements for the reliable destruction of different types of tank threatening targets and providing for the complete destruction of the fragmentation unit following explosive charge detonation in the projectile.