A total of seven special routes of U.S. Route 90 exist. Texas All of the alternate and business routes within Texas are maintained by the Texas Department of Transportation (TxDOT). U.S. Route 90 has one alternate route and two business routes within the state. Along US 90, TxDOT identifies each business route as Business U.S. Highway followed by an alphabetic suffix. Along Texas U.S. routes, the alphabetic suffixes on business route names ascend eastward and northward. There are gaps in the alphabetic values to allow for future system expansion or for decommissioned routes. The alphabetic naming suffixes are included as small letters on the bottom of route shields. Seguin–Houston alternate U.S. Highway 90 Alternate is an alternate route to U.S. Highway 90 in the U.S. state of Texas, running from west of Seguin east via Seguin, Gonzales, Hallettsville, Eagle Lake, Rosenberg and Sugar Land to northeastern Houston. South of Downtown Houston, US 90 Alternate is built to freeway and near-freeway standards along a section of South Main Street. Houston–Crosby business loop Business U.S Highway 90-U or Bus. US 90-U is a business route from I-610 in Houston northeastward to FM 2100 in Crosby along portions of McCarty St. and the Beaumont Highway in northeastern Harris County. The business route was created in 1992 when US 90 was realigned off the route between Beltway 8 and FM 2100. The portion of the business route between I-610 and Beltway 8 remained concurrent with US 90 until the completion of the current US 90 along the Crosby Freeway in January 2011. Orange business loop Business U.S. Highway 90-Y or Bus. US 90-Y begins at Exit 874A of the combined route of Interstate 10 and US 90 on the west side of Orange in Orange County. The route proceeds to the east along W. Park Ave. to FM 3247 where the route turns to the southeast along Strickland Dr. through western Pinehurst. After reentering Orange, the route is joined by SH 87, and the combined route proceeds to the east along MacArthur Dr. After SH 87 turns off of the route, Bus. US 90-Y continues east along Green Ave past FM 1006 and then turns north along Simmons Dr. returning to I-10 and US 90 at Exit 878. The business route follows the former alignment of US 90 through Orange until April 30, 1962. With the realignment, the route was designated State Highway Loop