Good link, Owen.
Cabotage is one of those ideas that may seem good, but have some unforeseen consequences.
When a company I was working for started doing Cabotage (legally, at long last!) it seemed really good. We were often able to organize our units to do a trailer swop and a short run at the end of a week. It saved the company having to subbie out the work, and avoided back to back ferry moves.
I don`t think many foresaw the way it has worked out with so many “flagged out fleets” and cut rates etc.
Regulators and Governments of all types are like oil tankers, they take a long time to change course.