A taxi driver or bus driver will call for backup if their vehicle breaks down. The passengers will quickly be off and on their way. A tow truck would be called to take the bus away.
I do not recall ever seeing a garbage truck being hauled away by a tow truck.
What do you do with a broken down garbage truck? It is a garbage truck. I couldn't stay to watch but I am wondering if the garbage men just heaved the broken truck into the back of the second vehicle with all the other garbage.
That is why I am thinking they just get thrown out.