In this situation, are you obliged to keep a safe distance from the vehicles you are passing by?

According to the provisions of the Road Traffic Act, a driver, when passing, is required to maintain a safe distance from the vehicle being passed. In the situation shown, you are passing vehicles stationary at the right-hand edge of the carriageway, therefore you must ensure an adequate distance to avoid a hazard, for example, in the case of a passenger suddenly opening a door.