IT now appears that this incident occurred around 7.20am on Wednesday morning, November 15, at the Aylesbury roundabout, Thame.
It followed an altercation 20 minutes earlier at the A418 junction with the M40, near the Wheatley services, shortly after 7am.
Police are trying to get CCTV footage from the junction and would like to hear from any witnesses to either incident.
All that is known at the moment is that a black car was involved.
Call Crime Stoppers on 0800 555111 with any information.
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