Special routes of U.S. Route 90
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