Assertion: semitrailer | /r/AtLocation | a level surface
Facets:
Source sentences:
text: The semitrailer must be equipped with a rear underride guard that is of sufficient strength to prevent a motor vehicle from penetrating underneath the semitrailer, extends across the rear of the semitrailer to within an average distance of 4 inches of the lateral extremities of the semitrailer, exclusive of safety bumper appurtenances, and is placed at a height not exceeding 22 inches from the surface of the ground as measured when the semitrailer is empty and is on a level surface.