Road device of reserve

A road device of reserve is a general term indicating " devices of reserve of vehicles and devices of reserve for pedestrians used on the routes" .

A device of reserve of the vehicles is a " device installed on the roads to provide a level of upper pond for a vehicle in détresse" .

This device of reserve of vehicle includes/understands: safety fences (on and except work of art), ends, connections, attenuators of shock and beds of stop.

The devices of reserve of the pedestrians are in fact of the Garde-corps.

History

Research on the devices of reserve of the vehicles began about years 62/63. Very quickly, the experimental method seemed the only possible one. In France the first tests were carried out on a track with BRON (close to LYON) in 1964. The organism in charge of these tests was called I' ONSER (National organization of Road safety) then INRETS (Laboratory of the shock): National research institute and of Studies of Transport and Safety, to be to date TO BIND it: Laboratory INRETS road Equipment.

At the beginning, objective single I' was to retain a light vehicle. However the first devices tested proved to be ineffective and one needed 7 to 8 years research to develop a panoply effective solutions: " glissières".

Towards the end of the year sixty, following serious accidents, a second more ambitious aim was had: to retain a coach of 12 T. There also the first devices tested proved to be ineffective and one needed 6 to 7 years research and tests so that I' one can develop products that I' one chose to call “barriers”.

This constituted the base of the terminology until recently. Currently taking into account the evolution of the traffic and the nature of the park of the heavy trucks, the studies aim at developing barriers intended for the reserve of heavy trucks of 16 T, even 38 T.

Railing

The current railings are designed to ensure the safety of the people. However a railing, especially reinforced, can retain light cars under relatively favorable conditions of shocks. One will however not speak about device of reserve against the exits of vehicle.

Safety fences

The term “ slides ” is abandoned in standards NF IN (European standards translated into French) in its general direction and is preserved only for the models known as " slides simple GS " with elements of slip in profiled of type has or B.

According to their operating process, one distinguishes two types of safety fences:

the flexible barrier " who becomes deformed at the time of a shock and who can preserve a deformation after the shock. This includes the flexible barriers having a deformation of which a part is permanent, of variable size, and the elastic barriers which admit a deformation whose greatest part is instantaneous and nonpermanente. These last are used little in France for various reasons (sometimes important arrows, secondary risks, problems of establishment. . ).

the rigid barrier " who presents a negligible deflection at the time of a shock of vehicle”. If the deformation is so much either can important, the barrier breaks and cannot function any more.

One distinguishes also the simple barrier “conceived to be run up only one side” of the barrier doubles which is conceived to be run up on each side.

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