 The roads of Beltway 8 and their freeway core, the Sam Houston Tollway, are the next loop, at a diameter around .A planned highway project, State Highway 99 (the Grand Parkway), will form the third loop outside of Houston.Currently, a completed portion of State Highway 99 runs from U.S. Highway 59, Near New Caney, to U.S. Highway 59 in Sugar Land, southwest of Houston, and was completed in 2016.