The bell rings loudly at the firehouse and the fire crew jumps into action. They quickly dress and hop aboard their shiny red fire truck and pull out of the station. They've got just minutes and need to be on the scene quickly. Luckily, the driver of fire truck knows how to get the crew to any location in the fastest way possible — her mind is filled with detailed maps and knowledge about the layout of the town — but more importantly, she has procedure rules to follow based on the density and speed of the traffic she might encounter. You see, the fire crew — any fire crew — is extremely sensitive to latency: any delays or a high-number of jittery-drivers in front of them could spell disaster for saving people from the blazing building across town. Our driver knows the established policies based on conditions seen along her route. Should there be a slow-down or even bumper-to-bumper traffic on the freeway, then she needs to drive on the shoulder of the road. What if the projected route is under construction and there's no ability to drive on the shoulder because concrete barricades have narrowed the lanes? She has a policy or a procedure for that, too. She can drive an alternative route (such as back-roads or feeder roads) or even drive on the wrong side of the street to meet her timeliness objectives.
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