In development of Fairlady Z, 67 car prototype cars were installed in collision experiments because consideration for safety at the time of collision was a big theme only for ultra high speed cars. In the case of a frontal collision, a method of absorbing energy by deformation of the front part of the body and reducing the influence on the occupant, in particular, a method of lengthening the nose, further weakening the tip part, and increasing the rigidity near the dash cowl is adopted There. That was supported by an experiment (photo) that collides with a concrete barrier at a speed of 50 km / h. The deformation from the front end of the vehicle to the front cross member part is completely collapsed (deformation amount 853 mm → 300 mm), then the suspension member part is deformed by about half, and the rear part thereof is hardly deformed (deformation amount 750 mm → 710 mm) . In this experiment, the maximum deceleration on the front seat floor surface, 44 G was recorded, but when looking at other cars belonging to the same class, it is 60 to 80 G, and the effect of energy absorption of the body is sufficient - Because this deceleration is extremely short as several tens of milliseconds, the possibility of being tolerable by humans is large. As for the collision from the rear part, in the case of the notch bag type, it is mainly absorbed by deformation of the trunk room, but in Fairlady Z it is fast back, so the rear gate, the roof and the front pillar deform to take energy absorption method It seems to be. It is worth noteworthy that the consideration of the occupant's safe space retention is sufficiently confirmed also in the experiment even in the case of the rear collision.