In the presented situation, should you increase the distance when passing these vehicles?

Yes, in this situation you should increase your lateral distance. There is a person standing next to the vehicle you are passing, who might behave unpredictably, for example, by suddenly stepping onto the roadway. According to Art. 23 of the Road Traffic Act, when passing, you must maintain a safe distance from the passed vehicle, road user, or obstacle, and reduce your speed if necessary.