If the road carries trade and blocking it prevents that trade, like for example if they block the only access road to a coal mine. How it would happen in a city

If the road carries trade and blocking it prevents that trade, like for example if they block the only access road to a coal mine. How it would happen in a city where you can just go around I don't know. But here I think they got nabbed on a city road protest and charged for the blocking of coal transport. Though it sounds like blocking the coal exports actually happened before the new law was in force, meaning the new charges are basically vindictive.