29 CFR 1918.25 – Bridge plates and ramps (See also § 1918.86)
(a) Bridge and car plates (dockboards). Bridge and car plates used afloat shall be well maintained and shall:
(1) Be strong enough to support the loads imposed on them;
(2) Be secured or equipped with devices to prevent their dislodgement;
(3) Be equipped with hand holds or other effective means to permit safe handling; and
(4) Be designed, constructed, and maintained to prevent vehicles from running off the edge.
(b) Portable ramps. Portable ramps used afloat shall be well maintained and shall:
(1) Be strong enough to support the loads imposed on them;
(2) Be equipped with a railing meeting the requirements of § 1918.21(b), if the slope is more than 20 degrees to the horizontal or if employees could fall more than four feet (1.22 m);
(3) Be equipped with a slip resistant surface;
(4) Be properly secured; and
(5) Be designed, constructed, and maintained to prevent vehicles from running off the edge.