The merging traffic on to main carriageway sign is used to road users that there is a side road approaching that merges onto the main carriageway. This sign allows road users to be prepared to move over and allow the merging traffic space to enter the main carriageway. The 508.1 diagram UK road sign has no variation.
Material: R2/RA2 reflective overlay on aluminium composite backing
2.3.1. A sign to diagram 508.1 (S2‑2‑5, see Figure 2-6) or 509.1 (S2‑2‑6, see Figure 2-7) is used to give warning where two physically separated streams of traffic proceeding in the same direction join the same carriageway. These signs may be used only in situations where the traffic stream joining from a slip road crosses a road marking to diagram 1010 and is required to concede priority to any through traffic. They are not intended for use at lane gain junctions where one or more traffic lanes are added to the main carriageway. Diagrams 873 and 874 (S11‑2‑14) may be used in these circumstances.