The A48M at Pentwyn is closed in both directions this morning due to an ongoing police incident.
Traffic Wales has warned of severe delays in both directions and across the surrounding area, with motorists urged to avoid the route.
Police officers are currently at the scene.
Some local residents have reported being stuck in traffic for more than 45 minutes as congestion builds around the closure.
The affected stretch of road is typically very busy during the morning rush hour, carrying commuter traffic into and around Cardiff.
Drivers should allow extra time for their journeys and use an alternative route where possible.
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