Don't understand what you are saying re the first point. But, if the road from the school is a single lane (each way) road, who would they need to indicate to?. Makes no difference to the traffic on the road they are waiting to get on to. And any traffic behind them can't get out till the first car has, so makes no difference to them. If there is two lanes to get out of the school road and there is no option to go straight ahead, then clearly the left lane is to go left and the right lane to go right, so again I don't see why indicators would be needed.
As for the second point, personally I would be indicating to pass the truck, but the instructor may be saying, "where else are you going to go except past the truck". And if there is nowhere else to go, why indicate?. Of course if the learner driver is dithering, an impatient driver behind may decide to pass just as the learner driver pulls out. I bring this up because when I passed my bus test, the examiner remarked afterwards that, after passing another vehicle on a dual carriageway I indicated to pull back into the left hand lane. He said I didn't need to, "where else are you going to go?". Don't agree with that myself though.
Roundabouts?, well yes, that does seem to be a particular problem for many drivers regarding proper use of indicators. But on the specific point of leaving enough room for two cars to go side by side?. First, there are plenty of roundabouts where that simply is not possible. Secondly, if there are no markings on the roundabout to indicate two separate lanes, drivers can't really be blamed for not behaving as of there were.
Also, it isn't fair to have a go at the instructors for, "NOT TEACHING THEM RIGHT". Instructors are themselves instructed on whatever new method is deemed appropriate (whether right or wrong in your opinion). So if you want to have a go at someone, whichever governing body is responsible for deciding the instruction methods now used should be where your ire is directed.
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