 Until the 1970s the road ended at a junction with the A417 at Harwell.When the A34 was upgraded in the 1970s, the A4130 was extended north from Rowstock along the old line of the A34 to an interchange with the new A34 at Milton Heights, near Milton Park.A few years later, a new link road was built from Didcot to Milton Heights and became the A4130.