Going too slowly can be more dangerous than speeding

On Monday, I left Paphos at 10.30am and drove to Nicosia, returning at 1.30pm. I saw three police speed checks along the route.
Generally speaking, driving standards were good (apart from the lack of indicators). However, whilst these highways have a maximum speed limit of 100kph, they also have a minimum speed requirement of 60kph.
There was crane lumbering along partly on the hard shoulder; there were two lorries obviously overloaded, crawling along at about 10kph. A JCB certainly not going at 60kph. Other road users were approaching behind these obstacles and either braking sharply or worse, veering out into the other lane causing other vehicles to brake sharply.
I would suggest these are probably more dangerous than others who might be travelling at 120kph.