46 C.F.R. § 116.940 Guards in vehicle spaces.
Title 46 - Shipping
On a vessel authorized to carry one or more vehicles, suitable chains, cables, or other barriers must be installed at the end of each vehicle runway. In addition, temporary rails or equivalent protection must be installed in way of each vehicle ramp, in compliance with §116.900 of this part, when the vessel is underway.
Title 46: Shipping
PART 116—CONSTRUCTION AND ARRANGEMENT
Subpart I—Rails and Guards
§ 116.940 Guards in vehicle spaces.