1.- THE PROBLEM OF THE MOTORCYCLIST WITH THE METALLIC BARRIER
The metallic barriers represent two types of risk for the motorcyclist:
a) on the one hand, the direct impact of the motorcyclist against the post of the barrier may cause him serious injuries, often fatal.
b).- On the other hand, the free space between two consecutive posts can be crossed by the motorcyclist, being exposed to danger prevented by the metallic barrier itself (unevenness, obstacle...).
2.- SPM SYSTEM DESCRIPTION
The SPM system constitutes an optimal solution for the protection of the motorcyclists who hit against a metallic barrier. It is made of a continuous metallic screen of plane-trapezoidal profile, located below the beam and held to the barrier by means of a brancket in each post, taking advantage of the union of the beam to the spacer.
The instalation of the SPM system is easy and fast, not needing the disassembling of any component from the metallic barrier.
3.- COMPONENTS
SPM system is completely made of S235JR type and grade hot-rolled steel sheet according to UNE EN 10025 and hot dip galvanized according to UNE EN ISO 1461.The SPM system has surpassed full scale crash test with dummy, according to “Protocole d’essais de dispositif de retenue assurant la securite des motocyclistes” (Marché SETRA nº 97 41 026), in L.I.E.R. (Lyon, Francia): dummy of 80,5 kg, at 60 km/h and 30º, in two different possitions (position A and position B).
The H.I.C. rate (Head Injury Criteria), which evaluates the risk level of injuries in the head, has been 162 for position A and 154 for position B. The maximun permissible value is 1000.
The maximun dynamic deformation due to the impact of the dummy is 10 cm and the maximun permissible permanent deformation is 5 cm (position A) and 7 cm (position B).
In addition to the tests with dummies,
that define the good performance of the device with the motorcyclists, the SPM system has been full scale tests by means of vehicle impact, guaranteing that the protection of the motorcyclists does not reduce the effectiveness of the metallic barrier.
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