Primary State Highways were major state highways in the U.S. state of Washington used in the early 20th century. They were created as the first organized...

primary state highways, and secondary state highways were created as alphanumeric branches of those primary highways (for instance SSH 8D was a branch of PSH...

more secondary state highways (SSH). The following are the secondary state highways formerly associated with Primary State Highway 7. Secondary State Highway...

State highways can be technically defined as main extra-urban roads (type B road) or as secondary extra-urban roads (type C road). State highways that...

and a branch of Secondary State Highway 1D (SSH 1D) in 1937, during the creation of the Primary and secondary highways. In 1964, these two highways became...

system of state highways. Primary State Routes receive more funding than Secondary State Routes and are numbered as U.S. Routes or State Routes with numbers...

Revised Code of Washington in 1970. The former numbering system of primary and secondary state highways, using lettered suffixes and unnamed branches, created...

Primary State Highway 6 (PSH 6) was a Washington state highway in the older primary and secondary system that existed from 1937 until 1964 in Spokane...

Virginia Department of Highways, Map of Washington County Showing Primary and Secondary Highways, June 1, 1932 State Highway Commission of Virginia (August...

(December 1, 1965). "Identification of State Highways" (PDF). Washington State Highway Commission, Department of Highways. Archived from the original (PDF)...