A lorry travelling through roadworks on the M1 in Northamptonshire allegedly hit the car in front twice within the space of a minute.
The white lorry was behind a black BMW in the roadworks between junction 16 and the Watford Gap service station when the alleged incident happened between 10.15am and 10.30am on Friday, October 23.
The incident caused damage to the rear bumper of the BMW.
Witnesses, or anyone who knows anything about this incident, can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.