Mode of transport available, especially in underdeveloped or inaccessible regions. Although humans are able to walk without infrastructure, the transport can be enhanced through the use of roads, especially when using the human power with vehicles, such as bicycles and inline skates. Human-powered vehicles have also been developed for difficult environments, such as snow and water, by watercraft rowing and skiing; even the air can be entered with human-powered aircraft. Land transport covers all land-based transportation systems that provide for the movement of people, goods and services. Land transport plays a vital role in linking communities to each other. Land transport is a
Urs A. Meyer Urs A. Meyer Urs Albert Meyer is a Swiss physician-scientist and clinical pharmacologist. Meyer is professor emeritus of pharmacology. He obtained his M.D. at the University of Zurich in 1967 and worked as assistant professor in clinical pharmacology at the University of California, San Francisco. In 1974, he became Head of Clinical Pharmacology at the University Hospital of Zurich. From 1983 to 2008, Meyer carried out research and taught as professor of pharmacology at the Biozentrum University of Basel, where he also acted as Chairman. He has served in various World Health Organization and National Institutes of Health functions and