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In page Spanish Road:

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The layout of the Spanish Road was a large improvement over the previous system of moving troops through neutral territory. Maps used for Spanish expeditions had only the information that pertained directly to the military, excluding any other details. However, this forced the armies to use guides and scouts when they crossed unfamiliar terrain, since their extremely generalised maps could not guide them. Travellers on the road covered an average of 19 km (12 mi) a day, although in 1577 Spanish veterans left the Netherlands and marched 24 km (15 mi) a day because of the heat and in 1578, they made the trip at the rate of 37 km (23 mi) a day during the cold month of February.[1]