How many lanes does the autobahn have?
Autobahn
Most sections of Germany's autobahns are modern, containing two or three, sometimes four lanes in addition to an emergency lane (hard shoulder). A few other sections remain in an old state, with two lanes, no emergency lane, and short slip-roads and ramps.
Kreuz Kaiserberg
Near the interchange the A3 is a 2x3 lane motorway, but between the interchange on- and off-ramps is a 2x2 motorway. On the Essen side, the A40 is 2x2, but on the Duisburg side it has been expanded to 2x3. In addition, since 2014 the A40 has been further expanded between the Kaiserberg and Duisburg interchanges, only in the direction of Essen, to 4 lanes without hard shoulder. All the ramps are single-lane, except those that lead in multiple directions. In their transport planning document ("Bundesverkehrswegeplan"), the German government has designated widening the A40 to 2x3 lanes on the Essen side as highly urgent.