Sytadin provides real-time traffic data for Paris and its suburbs. Jonathan Hipkiss writes, “This site kept me sane when I lived in Paris and had to commute around the Peripherique daily.” (My condolences.) “It’s updated by the minute and gets its data from road sensors. The two most interesting pages are Etats de trafic (State of Traffic) and Calculs d’itineraire (Calculate your route); the latter gives good mouseovers for amount of time between points.”