Near Spanbroek you are driving behind a van. Your passenger asks how much distance the law says you must keep from that van. What do you answer?
Exactly two seconds; that number is written literally in the law
No fixed number: I must be able to stop within the clear road I can see ahead
A fixed distance in metres, the same at every speed
Explanation
False — a safe distance grows with your speed. The law names no fixed distance; with the rule of thumb (speed divided by 2, plus 10%) it is 27.5 m at 50 km/h and 55 m at 100 km/h (Book p.123).