Final answer:
An odd numbered interstate with a single or double-digit number indicates a route that runs north to south and connects major cities along their route.
Step-by-step explanation:
An odd numbered interstate with a single or double-digit number indicates a route that runs north to south.
For example, Interstate 5 runs from California to Washington, while Interstate 95 runs from Florida to Maine.
These interstates connect major cities along their route, but not all interstates that connect major cities are odd numbered.