Ian Hudspeth and Barry Wood say they worry some Government work in a key document is ‘misleading’ and needs more work.
The councils say studies only note the peak impact on junctions for one month. But they say other work shows the impact to be ‘much higher’ months after the work.
They say this means ‘greater consideration’ should have been given to looking at how much traffic would build up as a result of engineering for the rail project.
Both authorities note work in Stratton Audley, north of Bicester, no longer needs heavy goods vehicles to run between the A4421 and the Launton compound, where work is currently taking place.
But they argue the need for light goods vehicles to use that route still means residents will be ‘noticeably’ affected.