Originally Posted by
DiscoMick
The speedo cannot by law read less than the actual speed and usually reads several km/h, or up to 10%, above the actual speed, as others have said. For example, my GPS shows that when the D1 is doing 100km/h in top auto the actual GPS vehicle speed is 96 km/h.
So, if the speedo said 41 km/h the actual vehicle speed was probably about 37-38 km/h. Therefore, the vehicle was not speeding.
This speedo thing is a reason why speed cameras are set with a margin of several km/h before they go off, I understand.
Of course, as others have said, there were probably other reasons for failing the learner.