A luxury car worth £200,000 was seized by officers patrolling in an unmarked police car.
The distinctive gold and black Rolls-Royce Ghost was spotted driving erratically on the A666 in central Bolton, Greater Manchester, just after midnight on Sunday.
PC Matthew Picton, of GMP's Road Policing Unit, said: "It was stopped after being seen tailgating and generally driving aggressively and flashing other vehicles to move out of the way.
"They didn’t notice the unmarked police vehicle behind them.
When stopped, there was no insurance for the driver."
The 6.6L saloon was confiscated at the roadside.