Mode of transport carries its own motor. As of 2002, there were 591 million automobiles worldwide. Other users of roads include motorcars, motorcycles, buses, trucks, bicycles and pedestrians, and special provisions are sometimes made for each of these. For example, the use of bus lanes give priority for public transport, and cycle lanes provide special areas of road for bicycles to use. Motorcars offer high flexibility, but are deemed with high energy and area use, and the main source of noise and air pollution in cities; buses allow for more efficient travel at the cost of reduced flexibility. Road transport by truck is
Urs A. Meyer to the molecular mechanism by which drugs activate transcription factors such as nuclear receptors and thereby regulate the expression of drug metabolizing enzymes and drug transporters. 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