Sweden
The most important roads in Sweden are labelled national trunk road. In 1992, the parliament decided upon which roads were to become national trunk roads. They are considered recommended main roads for long-distance traffic.
National trunk roads are planned nationally, as opposed to other roads who are planned locally. They also have a special, slightly larger budget. However, they aren't signed in any special way. Therefore drivers will not notice any difference in signage, numbering, road standard or map marking from other national roads. Some national roads are only considered trunk for part of their length. National road 73 and National road 75 are both built to motorway standard, have high traffic but are not considered trunk. European routes are always trunk everywhere in Sweden, and are more visible with special numbering.
Read more about this topic: Trunk Road