What does an odd-numbered route indicate?

An odd-numbered route is generally designated to indicate a north-south direction in the United States highway numbering system. Routes with odd numbers typically run north to south, while even-numbered routes usually run east to west. Therefore, when considering the directional aspect, an odd-numbered route can point to travel in both the northern and southern hemispheres. The choice indicating northwest aligns with this understanding, as an odd-numbered route in a broader sense may extend to the northwest direction, especially when considering the layout of some states and highways. It is important to understand the overarching system of route numbering which is grounded in how these roads are mapped and used for navigation.