A689 Westbound closed, slow traffic due to accident, car and a tanker involved and spillage of diesel between Wolviston Services Roundabout and A19.
The short stretch of road towards the A19 interchange is closed.
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The constituency of Washington and Sunderland West includes the UK's largest car plant, which was opened by Nissan in 1984.
This seat was formed prior to the 2010 General Election, taking in Sunderland city centre and the Ryhope area to the south.
The constituency of Stockton South includes relatively affluent areas like Yarm and Eaglescliffe.