Nicholas Churchill, 40, of Brandon, Suffolk, left a 37-mile trail of destruction after rowing with bosses over the air conditioning in the cab of his dumper truck.
The 30-tonne vehicle crashed into three police cars, smashed down roads signs and bollards, causing more than £26,00 worth of damage, a court has heard.
The incident took place along the A11 from Norwich to Brandon last summer.
Churchill admitted being under the influence of drugs at the time of arrest.
Fergus Harold, prosecuting, said: “The defendant was at work driving his vehicle and had taken issue with his employers about the air conditioning in his cab.”
“He was told to get on with his job.
“But instead he has taken his vehicle onto the highway, and there followed a lengthy pursuit with a number of police cars and the helicopter dispatched.”
Churchill was given an interim driving ban and remanded on bail to be sentenced at Norwich Crown Court on February 5, when he could face jail.
