0898fffa_s__2_plus_1_roads__and_Signals__WHAT_THEY_MEAN
[ROAD MARKINGS] Double broken white lines along the centre of the road [WHAT THEY MEAN] 
These alert drivers to continuous white lines a short distance ahead. As a driver, you must not cross them unless it is safe to do so.
Traffic Signs, Roadway Markings, 2-plus-1 roads, and Signals
WHAT THEY MEAN