wrong-way concurrency
A road concurrency in which at least two numbered highway routes are signed in opposite, conflicting directions on the same stretch of physical roadway.
wrong-way concurrency: routes signed opposite on one road
A wrong-way concurrency occurs when two or more numbered highway routes share the same physical roadway but are signed to flow in opposite directions. This creates a situation where a driver following one route number will be traveling against the signed direction of another route number on the identical stretch of pavement. The routes occupy the same lanes, curves, and shoulders, yet their designations point travelers in conflicting paths.
This condition most often arises where state or federal highways have been rerouted over decades, but the old routing persists as a concurrent designation. For example, US Route 29 and US Route 701 might share fifteen miles of the same road in North Carolina, but Route 29 signs direct traffic northbound while Route 701 signs direct traffic southbound on that same section. A traveler following Route 701 northbound would be driving against the posted direction of Route 29.
Why wrong-way concurrencies exist and persist
Transportation agencies create wrong-way concurrencies through historical accident rather than design. When a numbered route is relocated to a bypass or new alignment, the old route number may not be fully decommissioned. Instead, it is overlaid as a concurrent designation on the abandoned corridor, sometimes in reverse direction relative to the main route occupying those lanes. Removing the old designation requires coordination between state DOTs, federal highway authorities, and local governments, a process that can take years and faces resistance from communities invested in the historic route number.
Wrong-way concurrencies create genuine navigation hazards. Drivers using older maps or GPS units showing both route numbers may become confused about which direction they should be traveling. Signage must be exceptionally clear to prevent wrong-way entry, particularly at intersections. Some jurisdictions have begun systematically eliminating these concurrencies by formally decommissioning one of the conflicting routes and removing its signage, but thousands remain across the United States, particularly in rural areas where parallel routes and historical realignments are common.