Trafford is one of two boroughs which only partially reside in Allegheny County. The other part of Trafford is in Westmoreland County. Its kids go to the Penn-Trafford School District.
Unlike McDonald, Trafford's website actually acknowledges that part of it is in Allegheny County, which may be why it, rather than McDonald, was chosen as a filming location for the movie Kingpin.
And more interestingly, the historic part of this borough, referred to as "Old Trafford" is the home stadium of the legendary Manchester United Football Club.
On a more relevant note, it appears that the same company that made the crappy Baldwin Borough sign also made this sign.