The A4232 Butetown Tunnel Eastbound is blocked and there's stationary but light traffic due to an accident between Stuart Street and A4234 Central Link/Pierhead Street (Queensgate Roundabout)
Emergency services are arriving at the scene. It's not clear how long the road will be blocked.
The eastbound carriageway of the M4 is closed between J38 A48/Margam offslip and J37 A4229/Pyle due to an accident. Traffic Wales is warning of delays as all three lanes are currently closed.
Both South Wales and Mid and West Wales fire services are at the scene. A South Wales Fire Service spokeswoman said it is believed three cars have been involved in a collision and a car had also broken down nearby.
A South Wale Police spokesman said there had been a number of accidents on the M4 following a hail shower. He said no one suffered any significant injuries.
Replacement bus service running on Virgin Trains between Chester and Rhyl after vehicle hits a bridge at Shotton.
Slow traffic on M4 Eastbound at J44 A48 / A4230 / B4291 (Llansamlet)