RAF Croughton
Anne Sacoolas returned to the US after the 19-year-old's death last year.
Several incidents of cars driving on the wrong side of the road near RAF Croughton have now been reported to police.
A family spokesperson said footage of a near-miss close to RAF Croughton had "sent shivers down my spine and made me feel sick."
A spokesperson for Dunn's parents said the decision was 'further compounding the family's misery'.
The president said Boris Johnson had personally asked to set up a meeting between Dunn's parents and Anne Sacoolas.
The teenager's parents are travelling to the US in a bid to pressure the administration into doing 'the right thing'.