The "11B" could also be a reference to a legal clause. For instance, a parliamentary report on a Chinese loan for Zimbabwe was subject to approval by of the Constitution. A similar numbering scheme in a municipal traffic regulation could easily lead to a phrase like "Form 11B ZCS" in common parlance.
Confirmation of approved days, official designation, signature, and date of approval. zcs form 11b
: Once approved, a copy is usually kept in the officer's personal file, and another is sent to the human resources or payroll department. The "11B" could also be a reference to a legal clause