On a country road near Apeldoorn, dense fog, no sign at all. What governs how fast you may drive here?
You must be able to stop within what you can see, even though no sign names a number
Without a sign, no speed rule applies at all in the fog
Explanation
Wrong — trap: every-article-has-a-number reflex (here: no number = no rule). The stop-within-sight rule always applies, with or without a sign, precisely without a fixed number.