As AusXH has said, Learners do need to experience driving on these types of roads, as irritating as it can be for other drivers on these very same roads.
The only problem I see, and it would be a hard one to do anything about, is the fact that learner drivers are only allowed to do 80kph. Then, as soon as they get their P's, they can do 100kph. It's only 20kph, but at these sorts of speeds, it makes a lot of difference.
There needs to be something done to bridge that gap. Learners do need to experience driving at 100kph, even if it is only with a Licenced driving instructor (probably the best option).
It may look good and it may be good, but it's rubbish!