Survey whiskers! They’re pretty commonly used to mark buried utilities, sightlines, possible expansions, etc. It looks like this one has been gone over with a mower. They last a really long time compared to stakes or poles (in that they can’t be easily knocked down), are much faster to install and are often easier to spot in low/medium-low grass and brush than flags or spray marking.
![[Solved] At a music festival in Germany that takes place at an airfield](https://leminal.space/pictrs/image/ef003f72-80ea-4382-a91e-a30c247bb0fd.jpeg){kind=link}
Survey whiskers! They’re pretty commonly used to mark buried utilities, sightlines, possible expansions, etc. It looks like this one has been gone over with a mower. They last a really long time compared to stakes or poles (in that they can’t be easily knocked down), are much faster to install and are often easier to spot in low/medium-low grass and brush than flags or spray marking.