The Prime Minister is in Berlin with world leaders including US Secretary of State Mike Pompeo, at a summit on Libya.
The Prime Minister said: "We’re certainly raising all those issues, about the driving habits of US personnel at the base, and we’re continuing to work for justice for Harry Dunn and for his family."
Footage has emerged of another vehicle which appears to be on the wrong side of the road near RAF Croughton
Mr Johnson’s statement comes after footage emerged of a suspected US government car having to brake sharply on a country road near the base.
RAF Croughton became the focus of an international controversy after 19-year-old motorcyclist Harry Dunn was killed in a head-on collision with a car on August 27 last year.
The newly emerged footage of a near-miss close to RAF Croughton was released as police revealed details of a separate incident in which a police vehicle was struck by a car being driven on the wrong side of the road in October.
The video, reported to Northamptonshire Police on Saturday, shows the blue BMW has what appears to be one of the registration numbers used on US government vehicles in the UK.
In a statement, said: "I do not underestimate how much of a concerning incident this was and how much worse it could have been, especially considering the circumstances in which 19-year-old Harry Dunn tragically died."
He added: “I want to be absolutely clear on the fact that these incidents just cannot keep happening.
“We know all too well in the case of young Harry just how devastating they can be."
The Prime Minister previously said that police were right to appeal for extradition but said the chances of Ms Sacoolas returning were "very low".
"That’s not what they do," Mr Johnson said, sparking criticism from Mr Dunn’s family who later said the Prime Minister had no intention to meet them.