Ok, so, if you disconnect a road, it will at some point reconnect . At least so far in my games that is the case. So what you do is, figure out what buildings you plan to use for the whole game. Look over map, see where industries can make their own connection.
Break those chains, make new dirt roads that cannot complete the chain. When there is no comp for goods, you need to over power that station with delivery methods. Weather it be truck or train, you want more spots then goods. This will force the game to deliver all the goods to your depot. When your industries expand, add more delivery methods.