But that´s not allowed for them as for you. A violation against applicable law does´n´t always mean an accident, but it always potentially dangerous. And if you make big or more violations it will let you fail your practical exam.
As in at the chapter “priority” it is important that you note the right things and take the right looks. Not just at crossings. You should see all signs and marks, should follow the rules and react on mistakes of other road user. If you look what others do it is not always the right thing. So better look by yourself what you have to do.