What does the sign with two lines merging together indicate?

The sign indicating two lines merging together serves as a warning to drivers that they are approaching the end of a dual carriageway. This is significant because it informs motorists that they will transition from a road designed for high-speed dual direction traffic, with separation between opposing lanes, to a single carriageway configuration where lanes may not be divided. Understanding this sign is crucial for maintaining safety on the road, as drivers must be prepared to adjust their speed and lane positioning to navigate the upcoming configuration changes safely. This foresight allows drivers to manage their expectations and mitigate the risk of collisions as they move from a dual carriageway to a different lane arrangement.