Association between Cellular-Telephone Calls and Motor Vehicle Collisions

Because of a belief that the use of cellular telephones while driving may cause collisions, several countries have restricted their use in motor vehicles, and others are considering such regulations. We used an epidemiologic method, the case-crossover design, to study whether using a cellular telephone while driving increases the risk of a motor vehicle collision.We studied 699 drivers who had cellular telephones and who were involved in motor...