You will find Cycling Routes all over Denmark. The signs may vary slightly, but they all look somewhat similar to the picture. These routes do not show up on the map, but are partially ordered geographically and can be useful to know about. They show up surprisingly often in NM but are rarely visible in NMPZ. 

Sometimes, you can see town names  of nearby towns either on or below the sign. 

There are 11 national routes in Denmark. You see them indicated by a red box around the number. They are ordered into three categories. 

Odd numbers go North-South with 1 being furthest west and 9 being furthest east. 

Route 2, 4 and 6 go from east to west, with 2 being the furthest north and 6 being the furthest south.

Route 8, 10 and 12 are ring routes respectively in southern Denmark, Bornholm and Limfjorden. 

The panorama routes are numbered from 401-426 and can be divided into two regions.

From 401 to 416, the routes are along the western coast of Jutland, 401 being at the German border, and 416 being all the way north. They are approximately evenly spaced so if you see 410 you should go a bit further north than halfway. 

From 417 to 426, the routes are in southeastern Denmark. 417-420 are on Falster, the southernmost island in Denmark. 421-423 are on Møn and 424-426 are in southeastern Zealand. 

The location of the routes can be seen on the map. Note that the routes cover a small area around each pin but no route goes far away from the pin. 

The Bicycle Highways are exclusive to the Copenhagen area (left) and can therefore be very useful. They are indicated by an orange 'C' (right). You can learn the specific numbers but this is not very useful as they are not ordered into a nice pattern. 

You can sometimes read the name of the route which is typically named for a town on the route, but be careful that the routes sometimes go far away from this town. 

The regional routes are the most common but also the least useful. They have white numbers surrounded by blue and are usually numbered less than 100. They are not nicely ordered, although there some patterns. Some of the routes also show up in very different parts of the country. If you want to see where the different routes are you can find them on http://www.opencyclemap.org/ where they show up in purple. 

On the island of Bornholm you can find these green signs instead of the usual blue ones. This unique to Bornholm.