Memory hook: Closure signs C: who, what and which number is barred
C17-C21 = number (dimension/mass). C22 = no number, dangerous load. C6 = not 'all motor vehicles' — only those with more than two wheels.
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- Challenge: Closure signs C: who, what and which number is barred
- The model: Closure signs C: who, what and which number is barred
- Core: Closure signs C: who, what and which number is barred
- Why it matters: Closure signs C: who, what and which number is barred
- Active recall: Closure signs C: who, what and which number is barred
- Teach back: Closure signs C: who, what and which number is barred