Waymark
The route is very well marked throughout its length, using a waymark of a red and white lozenge (divided vertically, and with its longer axis horizontal) on a yellow background. According to Bremke (1999), the original planners of the route intended that the red end should always point towards Konstanz and the white towards Freiburg; this rule is generally but not universally obeyed in the waymarking in place as of 2007.
Read more about this topic: Schwarzwald-Querweg Freiburg-Bodensee