[Code of Federal Regulations] [Title 7, Volume 6] [Revised as of January 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 7CFR500.4] [Page 377] TITLE 7--AGRICULTURE CHAPTER V--AGRICULTURAL RESEARCH SERVICE, DEPARTMENT OF AGRICULTURE PART 500_NATIONAL ARBORETUM--Table of Contents Subpart A_Conduct on U.S. National Arboreturm Property Sec. 500.4 Conformity with signs and emergency directions. Persons in and on property of the USNA shall comply with official signs of prohibitory or directive nature and with the directions of authorized individuals.