Drivers know all too well the frustration of clogged roads. Experts at the University of Maryland’s Center for Advanced Transportation Technology are diving in the ‘why’ --so deep into the data about traffic that about half the states turn to them for tools to manage congestion. CATT’s director Michael Pack says they can not only pinpoint the worst bottlenecks, but identify what caused them, how long the backups are, and how much they cost. Plus, Victor Henry and Ed Stylc, chief traffic-congestion management experts at the Baltimore Metropolitan Council, tell us how they use data to make recommendations to the state.