A recording I did at a pedestrian underpass in Ila, Trondheim, Norway.
Two contact mics attached to different spots on the hand railings (picture).
The sounds are the rain on the hand rails and the cars passing by the road just on the other side of the concrete wall.
There's also a deep punding rytmh I have no idea what is.
It turned up on all the recordings I did in that area, and it's a big car tunell not far away, so it could be something related to that.
Or perhaps some construction site.