It sounds obvious, yet many people have been flashed by cameras as they sped up because they saw a sign for a new higher speed limit, but they hadn’t actually passed the sign yet. This has also caused learners problems on test.
Unlike over 86% of other instructors I regularly sit in on my pupil's driving tests, so I am able to offer realistic 'mock' practice test to my pupils and explain EXACTLY what will happen on test, hence my exceptionally high pass rates.