Google maps already has it as Interstate 69 through Houston, and transitioning back to a state route north and south of the city. The actual numbering system is

Google maps already has it as Interstate 69 through Houston, and transitioning back to a state route north and south of the city. The actual numbering system is very simple, and explained at https://www.youtube.com/watch?v=8Fn_30AD7Pk https://www.youtube.com/watch?v=8Fn_30AD7Pk