BURSTVehicle emissions tests used to be done entirely in the laboratory. However, certain car manufacturers cheated on those tests. In response, the European Union introduced emissions tests in real traffic. To make such tests meaningful, they must be performed on routes that meet certain criteria, such as the difference in elevation between start and end points and the proportion of urban and country roads. Finding suitable routes is a complex search problem. Undergraduate students from Karlsruhe Institute of Technology, Germany, developed the first fully automatic solution for finding such routes. In this interview, they share how they did it.