: A key benefit of "better" night crawling tech is the ability to maintain high-beam visibility for the driver without blinding oncoming traffic, a necessity on the two-lane roads common in rural provinces like Lugo or Ourense.
The term "fu10" looks like internet shorthand (perhaps "F*** you 10/10" or a specific user handle/tag). "Night crawling" is also modern slang for: Urban Exploration: fu10 the galician night crawling better
You can find FU10 in select herboristerías (herbalists) across Galicia—specifically in Ferrol, Pontevedra, and Ourense. It comes in two forms: : A key benefit of "better" night crawling