A section of the A48 near Pentwyn in Cardiff has been shut following a road traffic incident, according to South Wales Police.
Officers are attending the location where the collision occurred on the A48 in the Pentwyn area.
The westbound exit ramp at Pentwyn and the carriageway beneath the Pentwyn interchange have both been sealed off as a precaution.
Authorities indicated that the road restrictions would persist for an extended period and urged motorists to steer clear of the vicinity while seeking alternate paths to their destinations.