Patriotic Brits have been warned they could face a £2,500 fine if caught flying Union Jacks from their cars to mark the King's Coronation.
Bunting and other Royal-themed decorations are being put up across the nation ahead of King Charles III's official crowning at Westminster Abbey on Saturday.
Millions will also gather at public and private events to raise a glass to the new monarch.
But experts have struck a note of caution if you plan on decking out your vehicle in Rule Britannia livery - as it could land you in serious trouble.
That's because such items could obscure a driver’s vision and therefore fall foul of motoring laws.
There's also the risk of them falling into the road, while insurance companies sometimes frown on such accessories.
Graham Conway, managing director of Select Car Leasing, said: “Excitement is building ahead of the King's Coronation this weekend. People are looking forward to celebrating at street parties and larger organised events, enjoying some of the things Britain is best at. But if you fancy showing off your Royal spirit by decorating your car, you must be aware of how this can go wrong and end up ruining more than your Bank Holiday weekend."
There’s no specific offence for driving with a flag attached to your car or van, and most on sale are perfectly legal if fitted correctly.
But one that is particularly large and obscures the driver’s vision could risk convening Regulation 30 of The Road Vehicles (Construction and Use) Regulations 1986, which states motorists must have a "full view of the road and traffic ahead".
Breaking this rule could see drivers slapped with a £1,000 fine and three points on their licence.
Select Car Leasing's Mr Conway said: "It's also important that anything adorning a vehicle is securely attached, and not liable to fall into the carriageway.
"If this was to happen and cause an accident, you could be charged with inconsiderate driving and face a fine of up to £2,500 and potentially a ban."
The other factor highlighted by Select Car Leasing is how such decorations can affect your insurance.
Some providers may consider them as a modification and therefore invalidate the policy.
Mr Conway added: "Showing your support for the new king with a flag, bunting or mascot won’t be a problem for most.
“But it’s important to make sure the driver’s vision is never impaired and it doesn't risk causing an accident to fellow road users or pedestrians."
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