The cart ruts are mysterious parallel grooves carved into the rock, found in various parts of the world and dating back to the Bronze Age. They are between 110 and 140 cm (43 to 55 inches) wide, can reach a depth of 60 cm (24 inches), and often branch out like railway tracks. Their purpose remains uncertain: some scholars believe they were ancient roads, with grooves formed by the repeated passage of carts; others hypothesize ritual or religious uses. In Pimentel, Sardinia, they reach the Pranu Efis necropolis, suggesting a possible link to funerary rites.
Source: Cart ruts in Sardinia: the example of Pranu Efis in Pimentel