Near Sluiskil you are driving at 80 km/h behind a vehicle doing 25 km/h; overtaking it would have taken about 87 metres. Just before you start, the vehicle ahead speeds up to 60 km/h. You are still doing 80 km/h. How much overtaking distance do you need now?
About 240 metres, much more than the earlier 87 metres
About 40 metres, much less than the earlier 87 metres
Still about 87 metres, because you yourself are still doing 80 km/h
Explanation
False — You only look at your own speed. The overtaking distance depends on the speed difference with the vehicle ahead: 60 x your speed : difference, so now 60 x 80 : 20 = 240 metres (Book p.143).