Where the tracks lead can tell us more about when they were made, and who used them. Tracks leading to these tombs could mean that the people who built them also made the tracks. Then again, it might be that folks from a much later time period created the tracks in order to access the old tombs as quarries. Also, in many instances, tracks run into the sea or right off of a cliff. This tells us that those tracks were made much earlier, before sea level rose and tectonic events like earthquakes changed the landscape. (Malta sits on a fault line between the Eurasian and African continental plates.)