Instead of the specially-shaped (New Jersey) concrete barrier used on US bridges, Algeria uses guard rail in front of ubiquitous blue, steel railing. Although its questionable whether the guard rail and steel railing is effective at deflecting vehicles back onto the road, it may absorb enough energy to prevent smaller vehicles from plunging off the deck. More likely the guard rail (and railing) is meant to protect people on the sidewalk. Its the length of the guard rail and the number of anchors (including cables buried at the ends) that keeps the rail intact.
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