Impact absorbing member for vehicle

A system for absorbing an impact, said system comprising:

• a blow molded thermoplastic energy absorbing member comprising;
• opposing first and second walls defining a hollow space;
• a plurality of fused pairs of recessed ribs, each said fused pair comprising first and second recessed ribs;
• said first recessed rib is integrally molded from said first wall and having a first recessed rib end;
• said second recessed rib is integrally molded from said second wall and having a second recessed rib end;
• said first and second recessed ribs being integrally fused at a welded surface disposed between said first and second recessed rib ends, said first and second recessed ribs being symmetrically disposed upon either side of said welded surface;
• an average distance from said first wall to said welded surface is about approximately 15.0 to 45.0 mm;
• an average distance from said second wall to said welded surface is about approximately 15.0 to 45.0 mm;
• said hollow space having an average height between said first wall and said second wall of about approximately 30.0 to 90.0 mm;
• said first recessed rib and second recessed rib are constructed to be permanently crushed in the process of absorbing the impact energy;
• and
• a swelling part disposed in said first recessed rib end.