A CRASH involving two lorries partially blocked the A420 between Oxford and Swindon, according to traffic reports.
The vehicles were on the westbound carriageway between Appleton and Fyfield. Police directed traffic at the scene.
It was causing delays in both directions, reports said, with traffic moving very slowly.
It has since been cleared. Thames Valley Police spokeswoman Jess Rodgerson said: "This appears to have been a damage-only collision."