In which situation should you NOT assume a vehicle's path is safe?

Answer: D — When the driver is waving you on

The situation where you should not assume a vehicle's path is safe is when the driver is waving you on. This gesture might seem like an invitation to proceed, but it can be misleading. Drivers may not have full awareness of their surroundings, and the driver waving may not be able to see other hazards that could pose a danger to you. In contrast, a vehicle’s turn signal being on is typically a clear indication of its intended direction of travel. A vehicle traveling slowly could suggest that it is preparing to stop or make a turn, which might indicate a safe situation to proceed. Similarly, vehicles approaching an intersection may be following traffic signals or signs that govern their path, making those situations more predictable. However, relying solely on gestures such as waving can lead to dangerous assumptions about driver intent and safety.