A map of Washington D.C. would show greater detail of roads than a map of Canada. Canada is a vast country, and a map of the entire country would have to be very small in order to fit all of the information on it. This would mean that the roads would be very small and difficult to see. A map of Washington D.C., on the other hand, would be able to show much greater detail of the roads, as it would only need to cover a small area.