A routing anomaly where a single stretch of physical pavement carries two different highway designations whose official directions conflict. For example, a driver travels on a road signed simultaneously as Northbound Route A and Southbound Route B, creating navigational confusion that traffic engineers must mitigate with careful signage.
Heard on the job
The detour routes traffic through the wrong-way concurrency on Interstate 81, so make sure the signs clearly show both the north and south shields.