The winter greenery made it difficult to work out this site, but it must look fantastic in the summer (I bought "Malta before History" - Miranda publishers - expensive but exquisite - see page 394 - as my holiday souvenir) with ruts running straight across flat ground and bending round and down the slope.
There's extensive quarrying in the area - almost right up to the edge of the ruts.
This post appears as part of the weblog entry Malta Day Trip