On the Driving Test Report, one of the areas looked at is headed
"Maintain progress". The notes for that section say,
"On test you needed to show that you can drive at a realistic
speed appropriate to the road and traffic conditions. You needed
to approach all hazards at a safe, controlled speed, without being over cautious or slowing or stopping other road users. You
should always be ready to move away from junctions as soon as
it is safe and correct to do so. Driving too slowly can frustrate
other drivers which creates danger for yourself and others."