European route E3 is a series of roads in France, part of the United Nations International E-road network. It runs from Cherbourg to La Rochelle.
The E3 in Århus, Denmark, before 1975: Changed to E45.
 
International E-road network
 
The international E-road network is a numbering system for roads in Europe developed by the United Nations Economic Commission for Europe (UNECE). The network is numbered from E1 up and its roads cross national borders. It also reaches Central Asian countries like Kyrgyzstan, since they are members of the UNECE.
E3 in Denmark, before 1992: Changed to E45; the number E3 was re-attributed.
Intersection of E42 and E451 near Frankfurt Airport
The European route E90 near Torregrotta, Italy
The E201 in the Republic of Ireland