You are driving someone who holds a valid Accessible Persons Parking Permit. Does displaying that permit let you stop or stand anywhere a NO STOPPING or NO STANDING sign is posted?

Correct answer: B. No — the permit exempts you only where a sign specifically grants that exemption, and parking, standing and stopping each have their own sign

No. The permit is only an exemption where a sign grants one. Book 5 sets out three separate exemption signs: the ACCESSIBLE PARKING PERMIT sign (Rb-93), which "must be used to exempt vehicles displaying a valid an Accessible Persons Parking Permit from parking prohibitions at designated parking spaces"; the ACCESSIBLE STANDING EXEMPTION sign (Rb-94), used "to exempt vehicles displaying a valid Accessible Persons Parking Permit from standing prohibitions"; and the ACCESSIBLE STOPPING EXEMPTION sign (Rb-95), which does the same for stopping prohibitions. Each is a different sign for a different prohibition, so the exemption reaches exactly as far as the sign in front of you says it does. A separate VAN ACCESSIBLE tab may be added where the space is big enough for a van.

Source: MTO Driver's Handbook: Ontario Traffic Manual, Book 5 — Regulatory Signs (December 2021), Section 13.3 — Accessible Parking Control Exemption Signs (Rb-93, Rb-94, Rb-95)