A frightened driver spoke out of his experience after being followed by a "dodgy" car on the A46.
The motorist, who said he wants to remain anonymous due to safety concerns, has now warned other drivers following the incident.
It all happened on Sunday (February 27) as the man was heading south on the A46 just after 9pm.
He then turned off to enter Bingham on the old Fosse Way at the Car Carston turn off.
But it was in that moment when he spotted a "dark grey, or black Audi A4 sports car" parked at the roundabout, in a gated area, facing out onto the road.
"As soon as I passed, to head along the Fosse Way, it sped out and immediately pulled up behind me, flashing its headlights," the driver said.
"I could not see any number plate to read the registration, nor how many were in the car."
It was a specific detail that concerned the driver the most, he explained.
He added: "What alarmed me was the fact that someone inside the car was holding up a device, or a device connected to the windscreen, and it flashed a blue light.
"This was not a police blue lamp, but what looked like some handheld device with horizontal blue bars, perhaps three inches wide."
He described the incident as "very dodgy", and has offered details about what happened that night.
The driver went on and said: "My initial instinct was to stop.
"However, the blue light remained on, not flashing, and the driver was driving way too erratic, just a foot or so from my bumper, flashing his headlights.
"I slowed, they remained in place, and I realised that along that stretch, there was nobody else about."
He said he knew "something was wrong", so he kept going.
"When I reached the Fosse Way island, I slowed down, with the Audi intent on stopping me, but staying directly behind.
"I entered the island in the left hand lane but kept going straight on, staying on the Fosse Way. The Audi suddenly flashed, hit its horn in anger several times, and drove away at great speed up the A6097 toward Gunthorpe."
The driver said he is now grateful that he did not stop.
He added: "God knows what would have happened if I had.
"I do not believe this was a real police car because the driving was way too dangerous, and a solitary, non-flashing blue light held up in the windscreen was no proof that he was legitimate.
"I am concerned that any young driver, or an inexperienced driver might have pulled over in that instance, and I dread to think what might have happened.
"It is very dodgy and scary."
Nottinghamshire Police have also offered drivers advice following this "unnerving" incident.
Inspector Clare Gibson, of Nottinghamshire Police’s Roads Policing Unit, said: “Experiencing what is being alleged in this instance is undoubtedly unnerving. The safety of residents and those on Nottinghamshire’s roads is paramount to us and we would urge anyone who experiences such an incident to get in touch as soon as possible so that we can investigate.
“Whilst this hasn’t been reported to us and we can’t comment on the specific nature of the claims, we would advise anyone who believes they are being pulled over by an unmarked car to first of all look for a few key identifying features.
“Unmarked cars have sirens and lights built in, as with a marked police car, and, if illuminated, you will see lights around the vehicle which are located both internally and externally.
“We would also advise you acknowledge the request to stop and, if still unsure or you feel vulnerable, then pull over in a more heavily populated area or public place.
"Once at a stop, you can also make sure you have a form of communication to hand, such as a phone, and if you feel you need to do so you can keep the doors locked until you have verified it is an officer through their warrant card.
"Genuine officers will always be more than happy to verify their identity.
“If you feel you are in immediate danger, you can also call 999 once stopped in a public or other safe place, where call handlers will remain on the line with you whilst the appropriate response is actioned. You can also report a non-urgent incident through 101.”
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