Half ofthe stroke patients in thestudy lived within 1km of a major road in the Boston metropolitan region, and the rest lived between 1km and 10km (six miles) away.
Hence teatime at the Institute for Advanced Study down theroad from us in Princeton, credited for the birth of countless collaborations and papers since it began in the 1930s.
Current municipal traffic monitoring systems study individual stretches ofroad that use induction loops to sense the passage of cars, or complex camera systems that capture licence plates.