the line '' men and horses are stationed along the road, equal in numbers to the number of days the journey takes'' clearly meant that upon every station there is a man and a horse waiting for the person to arrive with the courier. the first person will rest through the night and the other will carry on to the next stop. this is how their work is faster than others.
another thing that has been mentioned in the paragraph is that they don't care about the weather. they are all prepared for whatever they are about to meet in their way. this is one reason they are unstoppable.
modern forms of popular music