Question: The M3 forms the southerly part of a E-road network which is how long?

Context articles: European route E105
M73 motorway
European route E62
Cape Zevgari
European route E05
Rhoose Point
European route E51
European route E76
M3 motorway (Great Britain)
European route E372

E105 is part of the International E-road network, which is a series of main roads in Europe.
 It is a North-South reference road, meaning it crosses Europe from north to south and other E-road numbers have been calculated based on these reference roads.
The M73 is a motorway in Glasgow and North Lanarkshire, Scotland.
 It is 7 mi long and connects the M74 motorway with the M80 motorway, providing an eastern bypass for Glasgow.
 The short stretch between Junctions 1 and 2 is part of unsigned international E-road network E05, where it continues along the M8 through Glasgow.
 To the south, the M74 motorway is also part of the E05.
The European route E 62 is a road in Europe and a part of the United Nations International E-road network.
 Approximately 1307 km long, it connects the French Atlantic port city of Nantes to Genoa, largest of Italy's port cities.
 Between France and Italy it also passes through Switzerland, via Geneva and Lausanne.
 After crossing into Italy (shortly after the Simplon Pass, the highest point on the European route network inside Europe), the E 62 passes Milan, Italy's largest commercial and industrial centre, before descending to Genoa on the Mediterranean coast.
Cape Zevgari, also known as İkizburun in Turkish, lies within Akrotiri and Dhekelia, a British Overseas Territory on the island of Cyprus, administered as a Sovereign Base Area.
 It is located in the Western Sovereign Base Area and forms the south-west point of the Akrotiri Peninsula which is the most southerly part of the island.
 The cape forms the southern end of Episkopi Bay.
The European route E 05 is part of the United Nations international E-road network.
 It is the westernmost north-south "reference road", running from Greenock, Scotland south through England and France to Algeciras, Spain.
 The route is 1,900 mi long.
Rhoose Point (Welsh: "Trwyn y Rhws" ) is the most southerly settlement of mainland Wales, although there are claims that Breaksea Point is the most southern point.
 The Vale of Glamorgan Council had installed a permanent notice verifying Rhoose Point as the most southerly part of Wales’s mainland and there is a small stone circle marking the point as well.
European route E 51 is a road part of the International E-road network.
 It begins in Berlin and ends in Nuremberg, Germany.
 It is 410 km long.
European route E 76 forms part of the International E-road network.
 It runs in Italy, from Migliarino Pisano, near Pisa, to Florence, by way of Lucca, Pistoia, and Prato.
The M3 is a motorway that runs from Sunbury-on-Thames, Surrey, to Southampton, Hampshire, a distance of approximately 59 mi .
 Along with the A316, the M3 provides the main artery into South West London, as well as providing access to major towns and cities along its route, which include the Aldershot Urban Area, Basingstoke, Winchester and Southampton.
 From Junction 9 (A34) near Winchester, to Junction 14 (M27) on the northern fringe of Southampton, the M3 forms the southerly part of the unsigned E05.
 It was constructed as a dual three-lane motorway for most of its length, except for the two-lane section between Junctions 8 (A303) and 9.
 The motorway was opened in phases, beginning with the first section (Junction 3 to 8) in 1971.
 It was eventually completed in 1995 on completion of the Junction 10 to 12 section, which faced widespread opposition because of its route through Twyford Down: numerous road protests were held during construction, which ultimately delayed its opening.
 Since then, the motorway has become a major artery to the South Coast, becoming a popular tourist route.
 Consequently, the M3 faces regular delays and congestion on its busiest sections during rush hours and seasonal periods.
 The Junctions 2 to 4A section is currently being upgraded to a Smart Motorway, which will turn the hard shoulder into a fourth lane to provide extra capacity.
European route E 372 is a B-type road part of the International E-road network.
 It begins in Warsaw, Poland and ends in Lviv, Ukraine.
 It is 367 km long.
 There are often hour-long delays at the Polish-Ukrainian border.