AIBU to think that if you are a proper driving instructor then you should know better than to take a really inexperienced driver onto the A3 at a point where it is basically a motorway, i.e. 3 lanes of 70mph (+!!!) traffic, hard shoulder etc....
I have to figure the learner was very inexperienced as they stalled at every junction prior to the A3 (I followed her at a distance for about 4 junctions), couldn't make 30mph on a straight road with no hazards at all, couldn't stay in the lane and kept swerving.
I thankfully overtook her on the slip road onto the A3, but she can't have made it to more than 30mph by the time she got to join the trunk Road and had swerved over the white line at the side and nearly went onto the grass.
Surely a driving instructor should realise a learner with that poor control should be on smaller safer roads?!