Reduction of injury severity involving guardrails by the use of additional W- beams, impact attenuators and "Sigma- Posts" as a contribution to the passive safety of motorcyclists.

Motorcycle collisions with guardrails are a severe safety problem. Especially hitting the posts lead to severe injuries of riders and pillion riders. A total number of 150 fatalities out of 1000 per year is estimated for the Federal Republic of Germany. To avoid fatalities and to reduce the severity of injuries these solutions are presented, fitting of the so- called "Sigma- Post" instead of the mentioned "IPE- 100"; fitting of an additional W- beam; fitting of special impact attenuators to guardrail posts.