Loop 9 is a state highway under phased construction on the southern fringes of the Dallas/Fort Worth Metroplex. When fully completed, it will span approximately 30 miles, running along the southern Dallas County line and extending westward into northern Johnson County. Although often considered the southern counterpart to the President George Bush Turnpike (PGBT), Loop 9 is part of a broader initiative to develop an outer loop that will serve the expanding DFW population forecasted to number 10 million circa 2040.