2024-15614. National Hazardous Materials Route Registry

A new Route Order Designator “D” added and assigned an “0” restriction.

Route Order Key

Each listing in the NHMRR includes codes to identify each route designation and each route restriction reported by the State. Designation codes identify the routes along which a driver may or must transport specified HM. Among the designation codes is one for preferred routes, which apply to the transportation of a highway route controlled quantity of Class 7 (radioactive) material. Restriction codes identify the routes along which a driver may not transport specified HM shipments. Table 1 presents information on each restriction and designation code. Table 2 presents information on the revisions to the route registry.

Table 1—Restriction/Designation Key

Restrictions	Designations
0—ALL Hazardous Materials	A—ALL NRHM Hazardous Materials.
1—Class 1—Explosives	B—Class 1—Explosives.
2—Class 2—Gas	I—Poisonous Inhalation Hazard (PIH).
3—Class 3—Flammable	P—*Preferred Route* Class 7—Radioactive.
4—Class 4—Flammable Solid/Combustible
5—Class 5—Organic
6—Class 6—Poison
7—Class 7—Radioactive
8—Class 8—Corrosives
9—Class 9—Dangerous (Other)
i—Poisonous Inhalation Hazard (PIH)

Revisions to the National Hazardous Materials Route Registry (March 31, 2023)

Table 2—Washington—Restricted NRHM Routes

Designation date	Route order route description	City	County	Restriction FMCSA (0-9 and i) QA comment
9/21/2023	Add South 188th St. between 28th Ave. S and 16th Ave. S	Seattle	King	0