 Occasionally, a special route will have both a descriptor and a suffix, such as U.S. Route 1A Business.In the field, the special route is typically distinguished from the parent route with the use of auxiliary words or suffix letters placed on the route shield or on an adjacent sign, known as a "banner" or "plate" or according to the "Manual on Uniform Traffic Control Devices", a "route sign auxiliary sign".A common roadfan synonym for special route is "bannered highway" or "bannered route", terms coined from the presence of these companion signs.