Not containing or crossed by any roads: roadless wilderness.
Forbidden by law to contain or be crossed by any roads or to be entered by any vehicles: tracts of land designated by the government as roadless areas.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.