Vikingeborgen Trelleborg

Increased need for transport Due to the increase in trade and the more complex structure of society, the demand for land transport grew stronger during the Viking Age. Transport by horse and in wagons over land was much slower and more troublesome than sailing. During harsh winters, land-based transport could include skiing, skating or sleighing. This increased the need for bridges and roads.
The Jutland highway
The Jutland highway, which was later named Hærvejen (“the Army
Road”) or Oksevejen (“Cattle Road”), cut its way along the Jutland
Ridge, making it possible to avoid most streams and rivers. From the
Hærvejen, smaller roads connected to the cities of Jutland, which
were not then internally connected.
Harold’s bridges
The most important testimony to the infrastructure of the Vikings is
found in the construction of bridges and dams, which made land-based
transportation easier and helped tie the nation together. Most
impressive was the bridge across the valley of the Vejle Stream in
Ravning Enge near Jelling. It was well over 700 metres long, 5.5
metres wide, and used colossal amounts of oak timber. It has been
dendrochronologically-dated to around AD 980 like Trelleborg. The
bridge was probably built by King Harold Bluetooth and must have
been part of the same general military rearmament and display of
Royal power as Trelleborg. Like Trelleborg, the bridge was only in
use for a limited time.

Udsnit fra vej i Wollin ca. år 950