Abstract: A plow blade is described which has first and second sections, e.g., a moldboard and a trip board, which are rotatable with respect to each other and maintained in a desired angular relationship with respect to each other via an elastic torsion joint. The elastic torsion joint includes an elongated inner member at least partially surrounded by an elongated outer sleeve. Resilient elastic cushioning wedges (e.g., elastomeric wedges) are situated between the inner member and outer sleeve in such a manner that rotation of the inner member with respect to the outer sleeve compresses the cushioning wedges and elastically resists rotation. The inner member and outer sleeve are respectively affixed to the moldboard and trip board (or vice versa) so that when the trip board strikes an obstruction and is biased with respect to the moldboard, the elastic torsion spring resiliently yields, and then causes the trip board to snap back to its original position with respect to the moldboard once the obstruction is removed.