There's a little interest -if all- to arrange traffic guidance properly during road maintenance operations. Usually you end up slowing your speed down to 30 kmph for some kilometers to ensure safe working conditions to the workers who are at home spending their sunday although the signs have been left to bug the law obeying public. This is also creating the inflation for the traffic signs, which I have written also before.
These pictures however present the guidance for alternative routing for bicycles on a construction site in Oulu. The first picture shows the starting point guidance and the second shows the guidance back to the original route. The first sign creates an assumption that following signs will also be visible and trustworthy. In the next available situation this customer trust is trashed.
-Remember to take a map with you..