Under what condition is an operator allowed to pass to the right of another vehicle?

An operator is allowed to pass to the right of another vehicle specifically under conditions that permit safe passing. This means that the maneuver should be executed when it is safe to do so, ensuring that the passing vehicle can do so without risk of collision or causing an accident. Safe passing may involve considerations such as the width of the roadway, the presence of bike lanes, or the conditions of traffic. It's essential for the driver to ensure that the action is not only legal but also safe, taking into account various factors like speed, visibility, and distance from other road users.

The other scenarios might seem like they could allow passing to the right, but they do not inherently guarantee safety in the maneuver. For instance, a parked vehicle still poses potential hazards such as opening doors or pedestrians walking in the area. A clear road does not automatically mean it is safe to pass, and simply being at a stop sign does not provide the necessary context for safe passage without ensuring all other conditions for safety are met.