In a residential area in Ede there is a no-parking sign with an under-sign below it showing only a lorry silhouette, without text. You want to park your car there. What applies?
You may park here; the ban applies only to lorries
You may not park here; only lorries may stand here
You may not park here; the under-sign is just extra explanation
Explanation
False — you treat the under-sign as a side issue. An under-sign with only a symbol decides who the sign applies to: this parking ban applies only to lorries, so you may park your car here. Book p.252.