Last updated 19-1-2019
N = new
U = upgrade of a dual carriageway to a motorway
O = only one carriageway
S = second carriageway
D = dual carriageway with motorway characteristics
Note: In principle the date of actual opening to traffic is given, but in some cases it may be the official opening date, which can deviate by up to a few weeks.
Sources:
Austria: http://members.a1.net/wabweb/frames/aab1f.htm
Czech Republic: 70 let dálnic ve fotografii
Germany: www.autobahn-online.de
Netherlands: www.autosnelwegen.nl
Marcel Monterie