På dansk Cykelsti
A cycle track: cyclists and small mopeds must use it, and cars must keep off it.
D Round and blue: something is required - a direction, a cycle path, a minimum speed.
Drawing from Wikimedia Commons, free of copyright under section 9 of the Danish copyright act. Code and name follow executive order 425 of 13 April 2023 on road marking. Study material, not the legal text.