The driver of a 44-ton articulated lorry who flashed his headlights and blew his horn moments before passing an unmarked police car is facing jail after admitting dangerous driving.
Kevin McKenzie (46) was involved in a "prolonged course of very bad driving" along one of Stafford's main roads, the town's Crown Court heard.
Andrew Baker, prosecuting, said: "He was driving a 44-ton lorry in a very aggressive manner.
"He caused a cyclist to pull over and a police car with two detectives in to go into a kerb. It was a movement which more than crossed the boundary of dangerous driving.
"He was very close behind the police car and flashing his lights and blowing his horn. The car was forced to brake heavily and the lorry overtook without regard for oncoming users.
"He was gesticulating and mouthing words towards the police car. There is a speed limit of 40 miles an hour for a lorry of such a size."
McKenzie, of Easton Road, Huyton, Merseyside, pleaded guilty to dangerous driving in November. Sentence was adjourned for reports.
He has previous convictions for careless driving and speeding, with nine points. Dangerous driving carries a maximum two years.
Catherine Ellis, defending, said McKenzie thought the police car was going to pull over.
"But it did not. It was a reasonable belief but he was certainly very close and blew his horn," she said.