Which areas need **detectable** warning surfaces/edges (hazard marking), per the key: **passenger pick-up / platform edges (boarding edges)** (option C in this dump).
Choices
- (A) All corridors
- (B) All stairs
- (C) Edges of passenger pick-up/loading platform zones
- (D) All elevators only
Correct answer: (C)
Edges of passenger pick-up/loading platform zones
Explanation
Key (C) — compare accessibility chapter “hazard and boarding edge” notes.