On the A16 near Dordrecht the fixed round sign along the road shows '100'; at the same time the matrix sign above your lane shows '80' due to congestion further ahead. You are driving 90. What do you conclude?
You are driving legally: the matrix sign is advice, the fixed sign counts
You are driving too fast: of the two numbers the lowest applies, 80
You are driving legally: as long as the fixed sign shows 100, you may do 100
Explanation
False — you let the fixed sign win because it is permanent. When a fixed sign and a matrix sign show a speed limit at the same time, the lowest applies, so here 80. Book p.49-50.