Code of Federal Regulations Title 49. Transportation § 49.33.31 Priority ratings

(1) There are two levels of priority established by the Transportation Priorities and Allocations System regulations, identified by the rating symbols “DO” and “DX”.

(2) All DO–rated orders have equal priority with each other and take precedence over unrated orders. All DX–rated orders have equal priority with each other and take precedence over DO–rated orders and unrated orders. (For resolution of conflicts among rated orders of equal priority, see § 33.34(c).)

(3) In addition, a Directive regarding priority treatment for a given item issued by the resource agency with priorities jurisdiction for that item takes precedence over any DX–rated order, DO–rated order, or unrated order, as stipulated in the Directive. (For a full discussion of Directives, see § 33.62.)