Bohuslän is largely a coastal county, and waterways have long dominated transport and personal travel. The valleys running south-west to north-east, cutting through hills and mountains, were difficult to cross. The clay bottoms did not facilitate access either.
The development of roads started in the borderland with routes for military transport and troop movements. These were gradually expanded and the "King's Road" from south to north became a concept (later named Rikstvåan).
In the countryside there were various types of roads, such as church roads, mill roads and district roads, which connected villages and farms. During the time of the Great Power in the 17th century, the state began to regulate travelling with inns and the erection of milestones.
Road maintenance also required solutions, including the use of road maintenance stones to mark who was responsible for which parts. The older flat bridges began to be replaced by arched bridges over larger watercourses. The Bohuslän milestones, which still stand along the older roads, are carved from limestone from Kinnekulle.
At the Munkedal local history association's buildings along the Munkedalsälven river there is a large collection of different road memorial stones, as well as a fantastic arched bridge over the river.
Street paving started in the early 1900s in the big cities and was then followed by the major country roads. In Bohuslän, there is a preserved part of the old Rikstvåan protected as a listed building where you can study the beautiful arches. This part is located south of Uddevalla. Other beautiful parts have been saved, for example in Gamlestan in Lysekil and in the northern part of the old street in Bovallstrand.
During the stone industry crisis in the 1920s and 30s, many roads were built around northern Bohuslän. Perhaps the best preserved and most exciting one runs along the eastern side of Dynekilen. There are also preserved guards here. During this time, motoring developed and many cross roads were built towards the sea side. In Hovenäset, there are well-preserved remains of such road construction where rock shafts and banks build up for the granite bridge over the bay.
The most spectacular object in the landscape is the Svinesund Bridge, which was opened in 1946. It was started in 1939 and replaced many different water communications between the two countries.