2007 ORS 801.263¹
"Engine brake"

(1) "Engine brake" means a device that converts a power-producing diesel engine into a power-absorbing air compressor, resulting in a net energy loss.

(2) "Unmuffled engine brake" means an engine brake that is not equipped with a muffler in good working order. [1993 c.314 §9]

1 Legislative Counsel Committee, CHAPTER 801—General Provisions and Definitions for Oregon Vehicle Code, https://­www.­oregonlegislature.­gov/­bills_laws/­ors/­801.­html (2007) (last ac­cessed Feb. 12, 2009).
2 OregonLaws.org contains the con­tents of Volume 21 of the ORS, inserted along­side the per­tin­ent statutes. See the preface to the ORS An­no­ta­tions for more information.
3 OregonLaws.org assembles these lists by analyzing references between Sections. Each listed item refers back to the current Section in its own text. The result reveals relationships in the code that may not have otherwise been apparent.