A standard approach here is to check if a node about to be added already appears in the priority queue.

A priority queue must at least support the following operations:

There are a variety of simple, usually inefficient, ways to implement a priority queue.

They provide an analogy to help one understand what a priority queue is.

A priority queue is often considered to be a "container data structure".

All other traffic can be handled when the highest priority queue is empty.

Another approach used is to send disproportionately more traffic from higher priority queues.

On average, a run will be 100% longer than the capacity of the priority queue.

However, any creditor who had contracted for a security interest would be first in the priority queue.

It must have a complex interrupt process, with food orders at the top of the priority queue.