Headquarters issues one manifest a day and everyone gets the same one: the same road, the same load, the same deadline, drawn from the date rather than from anything about you. What you are driving through is not invented — it is the live National Weather Service forecast along that Interstate, read at the hour you would actually reach each mile.

The bind is hours of service, and it is the real one. You get eleven hours of driving before you are required to take ten off, which means the question is almost never can I get through this — it is do I get through it before my clock runs out, or do I stop short and let it pass while I sleep. The weather keeps moving while you do.

Nothing is random. Two drivers making the same calls against the same forecast get the same result, which is what makes it a puzzle rather than a slot machine. Easing off costs you time and buys you a great deal of safety; pushing buys a little time at a price that rises very fast in ice. Running hard into snow will often cost you both, because weather slows you down whether or not you agreed to slow down.