Companies build private roads. To drive on those roads, they install a toll-booth at each entrance onto the road (like your house, office, warehouse, shops, etc) - every vehicle gets charged to enter the road network.
Large road companies usually come to some agreement that they'll join their roads at large intersections, but don't install toll-booths there, because it's good for each of them - after all, they still bill every car entering their road network, and better connections between road networks means more users of the road (and thus more revenue).
Usually when roads get congested, they make them wider, and where two road networks meet - each company pays to upgrade it's side of the road network.
This is how things have worked until recently.
Some road companies have decided that instead of upgrading their network, they'll make many of the lanes reserved for 'preferred road network users'.
Now, if you order from a store affiliated with the road company - things will work like they used to. But if you order from an unaffiliated store - that delivery will take much longer (or maybe not happen at all, if the road is too congested and the driver turns around and goes home)