One effect would be that a road junction could turn into one where no car has priority in the absence of road markings. I think the sign is really saying "be careful".

I have experienced this sign many times over 5 decades of driving. If you want the facts spelled out, here goes.

Sometimes, existing road markings are obliterated by resurfacing or surface planing prior to re-surfacing. A 'No Road Markings' sign will be erected temporarily to warn drivers that priority , like give way and traffic separation, markings may be temporarily absent, and they should exert caution regarding other vehicles. The markings will be restored.

Look after yourself on such a section and slow down.

wonder what they do when there is snow on the road ... all markings quickly covered over!!

Thanks for your post!

I have been driving on the continent for over twenty years, so I'm a bit fusty when it comes to UK rules. Here in Switzerland, when there are not "give way" signs we must give way to traffic from the right, no matter the relative sizes of highways.

Does the same apply from the left, in the UK?

I hope you can advise.

No road markings has a quite simple explanation, you have found yourself in Basingstoke. There are so many roads here where the markings have just gone and are not repainted. Unfortunately it is very difficult to complain as our local council is not responsible, it falls to the county council who of course have the whole county to look after.

A year or so ago signs appeared on the A6 between Stockport and Buxton saying "Cats eyes removed"

A few days later an identical sign appeared just down the road saying "Mice very happy"

Somebody put a lot of effort into making that sign!

I agree with you, but maybe to stop people thinking it is a 1 way street, like people believe that a roundabout with no road markings is only for single file traffic and normal roundabout rules do not apply.

Maybe to stop people driving in the middle of the road and having to swerve to avoid oncoming traffic.