Emergency services have declared a major incident after a vehicle caught fire in a tunnel.
Crews are attending the incident in the Conwy Tunnel on the A55, North Wales Fire and Rescue Service said on Thursday.
“We’re working with multi-agency partners to control the fire, protect the environment and re-open the tunnel as soon as its safe to do so,” the fire service said.
The tunnel is expected to be closed in both directions for some time and anyone living nearby should close windows and doors, they added.
Arriva Buses Wales said all five of its services would be terminating at Dwygyfylchi, Conwy, until further notice, adding it could not serve Deganwy, Conwy or Llandudno.
Traffic cameras showed delays back to junction 20, Colwyn Bay, from just after 16:00 BST.
Surrounding routes around Colwyn Bay, Llandudno Junction and Conwy are also heavily congested as traffic seek an alternative, traffic information service Inrix said.
