[pct-l] bike impacts on trails

[Ken Murray]

http://www.uvm.edu/~snrvtdc/trails/ComparingHikingMtnBikingHorseRidingImpacts.pdf

Comparing hiking, mountain biking and horse riding impacts on vegetation
and soils in Australia and the United States of America
==========================
http://www.culturechange.org/mountain_biking_impacts.htm

The Impacts of Mountain Biking on Wildlife and People  
A Review of the Literature 
========================
http://www.bouldercolorado.gov/files/openspace/pdf_gis/IndependentResearchReports/238_Carter_Anna_Relative.pdf

RELATIVE IMPACT OF OFF-ROAD BICYCLE
AND HIKER TRAFFIC ON TRAIL SOILS:
AN EXPERIMENTAL STUDY, BOULDER, COLORADO