It then runs south as a single carriageway through Wing to Aylesbury.

The road has been rerouted in two locations so that it no longer runs through Hulcott and Haddenham.

The Oxford–Cambridge Expressway is a proposed fully grade separated dual carriageway between the A34 near Oxford and the A14 near Cambridge.

[2] One of the three alternative options originally proposed for the route uses the A418 corridor, bypassing Aylesbury to the north.

[2] In September 2018, the Government announced that the route would more closely follow East West Rail, which may mean that it will be closer to Winslow than to Aylesbury.