BN4 safety barrier
Steel vehicle restraint barrier for bridge edges. ADL manufactures the supports in its Bouskoura workshop; the rails are galvanised sections imported by ADL.
Use
The BN4 barrier is fitted to the edges of road and motorway bridges and structures. It restrains vehicles and prevents them from falling off the structure. The BN4 type is described by the Moroccan reference NM 10.9.299, which adopts the French standard NF P 98-421.
Components
- Supports: manufactured by ADL in its Bouskoura workshop from laser-cut, bent and welded steel plate, then galvanised. Support height: 986 mm.
- Rails: galvanised sections imported by ADL, assembled on the supports.
- Anchoring: base plates and shear bolts into the structure, as per the project drawings.
Our scope
Our engineering office checks the project drawings and specifications before manufacturing. ADL manufactures the supports, supplies the rails and installs them on site with its own teams, in coordination with the contractor. Compliance of the supply is demonstrated by the project documents.
For your quote
Send us the structure concerned and its location, the length to be fitted, the drawings, the specifications and the planned site date.
Visuals
Schematic, non-contractual
Safety barrier on a bridge edge 
Safety barrier along a viaduct
Frequently asked questions
What is a BN4 barrier?
It is a steel safety barrier for bridge edges: horizontal rails are fixed to supports anchored into the structure with shear bolts. ADL manufactures the supports in its Bouskoura workshop; the rails are galvanised sections imported by ADL. The BN4 type is described by the Moroccan reference NM 10.9.299, which adopts the French standard NF P 98-421.
Is the S7 railing a safety barrier?
No. The S7 is a railing that protects pedestrians on bridge footways; it does not restrain vehicles. It can complement a safety barrier on the same structure.
Do your products have an approval?
An approval is specific to a product and often to a project or a project owner. We only mention it on a product sheet when we hold the corresponding document, which can then be provided on request. For a tender, ask us for the file available for the equipment concerned.
Do you install on site?
Yes. ADL manufactures the equipment in its Bouskoura workshop and installs it on site with its own teams. In your request, state the structure, the length to be fitted and any site access constraints.