The Calendars of Megalithic Malta: Resolving their Functions and Anomalies by C R Sant is a paperback book available from Amazon.
This book is not mainly about cart ruts but they will always be linked to the megalith structures (temples) in some way.
Perhaps one of the most intriguing findings is that Malta’s and Gozo’s megaliths orientation appeared to be rebuilt around 3200 BC. Due to physical changes in the landscape by movement of the Maltese islands by Earthquake swarms as its on a Mediterranean fault line?
Ggantija North is adjacent to an older calendar, both having nearly same orientation. However the equinox to solstice angle in the later unit is 18deg, as against a previous 23deg in the older one. Reason for building a second unit on same orientation. Date: just after ~3550bce. Ggantija North became suddenly obsolete due to the 3200bce event.
C R Sant| Melita Megalithic
Or another interpretation is by a change in our planets tilt/axis as might be suggested by catastrophe investigators and those who follow the path started by Immanuel Velikovsky and his Worlds in Collision?
The author has a blog called Melita Megalithic