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ROAD SAFETY BARRIERS
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- Characteristics -
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These wall-shaped safety barriers are prefabricated from
concrete. They are typically divided into 6 meter sections. The barriers are
connected to each other with strong steel bars that are 1 meter high from
the supporting level. All barriers can be placed on bituminous pavement, LSC
curbs or directly on the ground. Lateral displacement during heavy impact is
guaranteed for all barriers. The Bridge-Border barriers are base-anchored.
This also allows lateral displacement, but it is more contained than
barriers which use simple support. The fatigue breakpoint load of the
anchored barrier is contained, and sent to the bridge. This type of barrier
also contains a “guardrail” above, which prevents from rollover, because of
the reduced displacement. This kind of protection is not useful in
non-anchored barriers. |
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The wall-shaped barriers are tested with
anthropomorphic mannequins to verify that passengers will not suffer
injuries during impact with them. |
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The wall barrier is specifically shaped in a particular
sequence of three slopes, in order to receive potential vehicle impact.
These barriers cause the impact load
to raise the vehicle onto the aforementioned sloped surface (creating an
acceleration absent in blade and picket barriers) and sending the vehicle
back onto the road, in around one second from the time of impact.
If the energy of the impact is more
elevated, the barrier also has a displacement that dissipates energy through
friction.
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The displacement led by wall-shaped barriers produces a
loop in the protection line. This displacement allows to safely handle
vehicle impact, preventing vehicles from bouncing back into the middle of
the road (which happens in elastic impact without displacement). This effect,
together with the rise-fall mechanism described above, facilitates control
of the trajectory and the redirection of large vehicles. The lower vehicle
damage, in regards to the metallic barriers is due, instead, to the
rise-fall mechanism. |
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The wall-shaped barrier, in all its forms, is the absolute
best in terms of controlling the redirection of vehicles, cargo trucks, and
motorcycles. |
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These barriers don’t cause visibility reduction because
they are shorter than the height of the driver’s eye. This is different
from other barriers in the same class, which reduce visibility with
their greater height and width;
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They do not require repairs after impact in 98% of all
cases. This reduces the need for roadwork for repairing the barriers,
which could potentially cause other accidents;
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Furthermore, traffic islands made from Jersey barriers
are cheaper than all other options.
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Wall-shaped barrier, in all its forms, can be designed in
colors and shading customized for the urban environment. |
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Side Border for road protection on mountains
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Traffic island for exposed roads in metropolitan areas
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Barrier between reserved areas (VIPs, bicyclists,
pedestrians) and normal traffic
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"ET100" h=100cm:
use - Single-Lane Traffic Island Wall - Class H4b |
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"ET100"
h=100cm: use - Side Border - Class H4b / Class H2 |
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"BP100" h=100cm: use -
Bridge Border - Class H4b |
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"H120"
h=120cm: use - Single-Lane Traffic Island Wall - Class H4b |
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"ET98" h=98cm:
use - Double-Lane Traffic Island Wall - Class H2 |
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"ET98" h=98cm:
use - Bridge Border - Class H2 |
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"H100"
h=100cm: use - Single-Lane Traffic Island - Class H3 |
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Redirecting border "ET100" h=100cm:
tunnel protection, retaining wall, side borders |
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Symmetrical barrier |
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Asymmetrical barrier |
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Anchored barrier |
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