Drivers have been warned against using a new car accessory made famous by social media.

The device, which became popular on the video-sharing site TikTok, could see motorists hit with a big fine of up to £1,000.

Shaped like a hand, the device can be changed to make gestures to other road users through the rear window – and can even give other motorists the middle finger!

Experts have now stressed how the lights could obstruct the rearview mirror and therefore breach the Highway Code.

They warned the tool could be distracting for other drivers, prompting road rage and increasing the risk of a collision.

Failing to comply with the rules could see motorists slapped with a hefty £1,000 fine and three points on their licence. Those driving larger passenger and goods vehicles could be forced to pay a higher fine of £2,500.

The new sign, which can be picked up for as little as £2 on TikTok, isn't the only LED-lighting mistake facing road users. 

Common LED car strip lights are also likely to breach The Road Vehicles Lighting Regulations (1989), which banned lights displaying a red glow at the front or back of a vehicle.