A rail for a lateral protection device, such as an under-run guard on a HGV, lorry etc, and a lateral protection device comprising two such rails, are disclosed. The rail 100 includes a longitudinally extending body comprising an outer surface. The body has a tensile strength such that the body is capable of withstanding a horizontal static force of at least 1kN applied perpendicularly to any part of the outer surface of the body. The outer surface comprises a flat portion 104 and further comprises an elongate channel 112, the channel having a depth direction parallel to the flat portion. The elongate channel is configured to accept an edge of a panel (502 figures 3 and 4), said panel may help to prevent a cyclist from grasping the rail and also draw attention to a dangerous area of a vehicle (800 figure 8). The rear surface 102 of the rail may have a recess 110 configured to receive a fixing element securing the rail to a strut (310a, b) secured to a chassis of the vehicle.
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