US 271 at state-highway Loop 286 in Paris, Texas. Note the double designation of "Business Business 271". Also note the word "business" within the shield, similar to those seen in Dalhart in the Texas Panhandle early in 2000.
According to Jonathan Winkler, this had, in fact, been the standard Texas practice since 1980, if not earlier. Jonathan further discovered in October 2004 that Texas had changed its standard for business-route markers to match the practices in most other states: using a separate "BUSINESS" sign above the shield rather than putting the word "BUSINESS" within the shield.
Photo courtesy of David Backlin (taken May 2004)