texas99The Grand Parkway (SH 99) is a 180-mile hhway, composed of 11 segments traversing seven counties. The Grand Parkway is intended to improve mobility, reduce congestionState Hhway 99 (SH 99), also known as the Grand Parkway, is a ring road in the U.S. state of Texas.Its first section opened on August 31, 1994. When the route is completed,