Through Mr. Hamilton, Mr. Acevedo was given a description of the unmarked police vehicles and approached on foot as they pulled into the minimart on Hellertown Road.
Markings from where the vehicle had hit bumps in theroad indicated the vehicle was travelling at "excessive speed" as it approachedthe bend, he told the court.
Officers said the unprovoked attack happened at 18:05 GMT on Thursday, when the family's Honda Civic approached a roundabout on Mauldeth Road in Burnage.