Green speed limit signs in the UK – what do they really mean?

Spotting a speed limit sign with a green border while driving in the UK can be confusing. It looks like a normal speed limit sign, but the green edge sets it apart from the usual red ones we all know mean business.

So, what exactly do green speed signs mean – and do you have to stick to them?

What do green speed signs - as in our mock-up - mean  (Credit: Wikimedia/Defacto)

Are they legally enforceable

Let’s clear one thing up straight away: green-bordered speed signs are not official road signs and they’re not legally enforceable under UK traffic law. You won’t find them listed in the Highway Code or the official government rules for road signage.

Instead, they’re usually put up by housing developers, private landowners, or local authorities to encourage safer driving in certain areas – but without making it a legal requirement.

It is worth remembering, though, the signs are there for a reason and sticking to the limit will help ensure safety for all road users and pedestrians in the area.

So, where do you see them?

These green signs often pop up in places like:

• New-build housing estates

• Hospital grounds

• School drop-off zones

• Supermarket car parks

• Private business parks

• Holiday parks and campsites

They typically suggest lower speeds – often 10mph, 15mph or 20mph – to reflect areas where you’re likely to see pedestrians, kids playing, or tight bends with reduced visibility.

Should you obey them?

Technically, you don't have to – because they’re not enforceable like red-bordered speed signs. But that doesn’t mean you should ignore them. They’re there for a reason – usually safety. If you were involved in an accident in an area with an advisory speed sign, going too fast could still land you in hot water for driving without due care and attention.

And if you're on a private road, different rules can apply – especially if it’s managed by a company or local authority that sets its own terms of use.

Why the green border?

The green border is used to make it clear these aren’t part of the UK’s standard road sign system. It avoids confusion with enforceable limits, but still grabs attention and gives a strong visual nudge to slow down.

Bottom line

Green-bordered speed limit signs in the UK are advisory – not compulsory – but it’s wise to follow them. Whether you’re in a quiet estate or a busy car park, these signs are a reminder to ease off the throttle and watch out for people around you.

So while you won’t get a ticket or points for ignoring one directly, showing a bit of care could help you avoid something far worse - which you could get prosecuted for.

 

 About us: Pete Barden Motoring and Travel News

See our privacy page here