Slow traffic due to people slowing to look at accident on A66 Eastbound between A1150 (Great Burdon Roundabout) and Darlington Road.
A vehicle has left the carriageway near the Longnewton turn.
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UNISON will now ballot its teaching assistants in County Durham over whether to accept the offer and end a two-year pay dispute.
The number secondary pupils in Stockton taught at a school rated 'good' or 'outstanding' has almost doubled to 91 per cent since 2014.
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