Landscape Conditions and Travel Time (IMAGE) University of Utah Caption The volunteers timed themselves walking along paths that the researchers designed to capture a variety of slopes, ground surface roughness, and vegetation densities. Credit Michael Campbell Usage Restrictions Non commercial with attribution License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.