16 U.S.C. § 110 — Laws and regulations applicable to added lands; free use of roads maintained by State

This section extends the park's rulebook to newly added land, with one exception for state-built roads. Extending existing law. All the laws that applied to, and were in force within, Mount Rainier National Park as of January 31, 1931, along with all regulations issued under those laws, now also apply to the land added to the park by section 109 of this title. In other words, the new land is folded into the park's existing legal framework — it doesn't get a separate set of rules. Free use of state-built roads. There's one specific carve-out: the United States can't charge a fee for using any road within the park that was built, or is maintained, exclusively by the State of Washington. If a road is a state project through and through, the federal government can't charge visitors to use it.