The E531 is a B-class road of the trans-European International E-road network in Germany, connecting the cities of Offenburg and Donaueschingen. Route and E-road junctions (via shared signage B33a then B33) Offenburg: E35 Villingen-Schwenningen Bad Dürrheim Donaueschingen External links UN Economic Commission for Europe: Overall Map of E-road Network (2007) International E-road network 531