0898fffa_s__2_plus_1_roads__and_Signals__WHAT_THEY_MEAN
[ROAD MARKINGS] Longer white lines / warning lines along the centre of the road [WHAT THEY MEAN] 
These warning lines alert drivers to hazards such as restricted vision, approach to a junction, approach to a roundabout, a hill, crests, bends and continuous white line ahead.
Traffic Signs, Roadway Markings, 2-plus-1 roads, and Signals
WHAT THEY MEAN