All I can find in the Highway Code is:
White direction arrows on the road indicate that you need to get back onto your side of the road.
from: https://www.gov.uk/general-rules-all-dr ... 127-to-132
And the linked PDF with pictures doesn't show them...
I had always seen them as a compulsory sign meaning that you are approaching a solid white line you can't cross, so you need to be on your side of the road before the white line...
however, I have increasingly noticed them approaching hazard spacing lines (dashed on both sides spacing the traffic apart - e.g. for someone to have space when waiting to turn...) e.g. here near me: https://www.google.co.uk/maps/@51.68613 ... !1e1?hl=en
as it is legal to overtake on those lines (though caution / warning / etc.) how do the two tie together - presumably the white arrows are advisory and not compulsory as there is no point between that position and the roundabout ahead (past the left junction) where the central lines are solid...
I am assuming that I am just confused!
Alasdair