At the very entrance to Puente de los Fierros, the camino splits into two different routes. The more common, less scenic, and completely along the roadway version is to the right and is signed La Frecha. Over the bridge, turn left and follow the 630. Alternatively, you can return to the mountains by turning uphill to your left towards Fresnedo. This route takes you through two hamlets and past one Ermita (San Miguel), and a fountain. Both routes rejoin in Campomanes. If you ask me, take the upper route via Fresnedo. The work you put into it will be worth avoiding the unforgiving asphalt.