Motorists faced delays on the A1 this afternoon after a two-car crash at Gateshead.
Emergency services were called to the Northbound carriageway near to the Angel of the North at around 12:15pm. Those involved were treated for minor injuries.
Two of three lanes were closed after the accident, although one has since re-opened.
More top news
All three lanes will be open between Leeming and Catterick, without roadworks, for the first time since the project began back in 2014.
The RSPCA say they do not know what the oily substance is or where it is coming from but some birds have died from the trauma.
Project leaders continue to work towards the estimated completion date of spring 2018.