About Dike roads and mountain driving: which statement is WRONG?
Take descents in the same gear as the climbs and make use of the engine's braking effect; do not drive with dragging brakes.
Dike roads are also winding and less clear than they look, have blind uphill side entrances, a narrow carriageway, sloping verges unsuitable for evasive manoeuvres, and overtaking is often not safely possible there.
When climbing a mountain it is best to shift to a higher gear, so the engine does not have to work as hard.
Climbing traffic must be given priority by descending traffic, not the other way around.
Explanation
trap: flat-road rule of thumb (higher gear is gentler) applied to a climb. Book p.69-70 - do not drive up the mountain in too high a gear; the engine is better off revving more than being lugged, because too few revs raise the engine temperature considerably and increase the risk of engine damage