M1X20 M1X, 4 M2X.
I can't see how you'd easily get a group of 20 mixed skill M2X students on the street at once.
Do you test their competency before taking them on the big bad Streets of Shannoville?
Do you run them through Belleville and the 401 for the test or highway 2?
We used to sometimes do five, but you can't just pile them all into a van for the demo now.