At a riding school near Limmen you hitch up a horse trailer (TMM 4,000 kg) and drive onto the A22. Two kilometres later you leave the autoweg and enter the built-up area of Uitgeest. What changes along the way?
On the A22, 80 applies (trailer too heavy for 90); in the built-up area that becomes 50
On the A22, 90 applies (autoweg figure, weight doesn't count here); in the built-up area that becomes 50
On the A22, 90 applies (with a trailer on an autoweg that's the case); in the built-up area that stays 90
Explanation
False — trap: weight-blind. The 90 km/u only applies up to and including 3,500 kg TMM; at 4,000 kg you fall back to the ordinary autoweg figure without the trailer reduction (Book p.119).