Driving on a dual carriageway and a multi laned motorway are entirely different.
And Morotoway driving is not easy, it is that myth that causes accidents.
I would prefer people to be 'taught' how to motorway drive, having driven Lord knows how many motorway miles over the years it is quite easy to see the novice, too close too fast, not able to keep straight line at speed and pull out with no concept of the speed.
It is not just the Learners though, it's pretty easy to see the 'occasional' motorway driver, usually with a caravan or trailer, as they are doing the same.