High Quality Content by WIKIPEDIA articles! State Highway 99, also known as the Grand Parkway, is a Texas highway, which opened its first section in 1994. When State Highway 99 is complete, it will be the longest beltway in the US, and the third loop within the Houston–Sugar Land–Baytown metropolitan area, with Interstate 610 being the inner loop, and Beltway 8 (Sam Houston Tollway) being the middle loop. The proposed 170-mile (270 km) loop has been divided into 11 separate segments for construction and funding purposes. Only two of the 11 segments are complete. As of December 25, 2011, all segments except A have been fully funded.