The examiner should observe whether the candidate has the vehicle under proper control and in the appropriate gear, takes account of the type of junction, road signs and following traffic, gives any necessary and appropriate signals in good time, and keeps the vehicle correctly positioned throughout. The examiner should also note whether the candidate takes adequate and effective observation before entering the intersection, and that they do so with due regard for other road users.
The route should still include some urban roads which will allow the examiner to observe the candidate’s reaction to crossing intersections during general driving. A driver who is over-cautious at a main road may act differently at a junction of less important roads.
The above is taken from The Driving Examiners Manual.
Where appropriate it has been reformatted and edited so it only refers to the driving of ordinary cars (class b).