such as without limitation solid or perforated walls extending upwardly from the platform floor 5 or a network of bars or rails in configurations other than that illustrated generally the material s from which the guard barrier is are made should be lightweight but strong and durable such materials may include without limitation metal such as aluminum steel and related alloys fiberglass plastic carbon fiber and wood the guard barrier also includes at least one outwardly tiltable portion 12 as illustrated in fig1 and 2 and fig3 and 4 tiltable portion 12 is constructed so as to be outwardly tiltable so as to define a surface or resting member on which an occupant of the work platform can lean so as to be able to extend his or her lateral reach relative to the position of the work platform the manner in which an occupant stands on work platform 100 and or leans on tiltable portion 12 can be clearly seen in for example fig5 a 5 b 6 a and 6 b as illustrated tiltable portion 12 is made up of a plurality of rails including a secondary top rail 3 and one or more secondary intermediate rails 13 when tiltable portion 12 is in its upright position as seen in fig1 and 3 for example top rail 2 and secondary top rail 3 together surround at least part of the periphery of the workspace defined in work platform 100 fig2 illustrates the manner in which tiltable portion 12 is outwardly tiltable tiltable portion 12 is for example pivotable about a hinge 7 a link 6 is connected between a top edge of tiltable portion 12 and an intermediate.