Picture A: an Off-highway Vehicle trail (OHV)
Pictures B and C: unimproved local road and improved local road
Picture D: a collector road
Picture E and F: arterial road and limited-access highway
Pictures taken from:
Webb, Robert H., Lynn F. Fenstermaker, Jill S. Heaton, Debra
L. Hughson, Eric V. Mcdonald, and David M. Millar, eds. The Mojave Desert: Ecosystem Processes and Sustainability. Reno,
Nevada: University of Nevada Press, 2009. Print.
Pages 174-175
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