Road Narrows Both Sides Permanent Post Mounted Sign - 516 R2/RA2 (Face Only)The road narrows sign should be used where a road with one lane gets narrower on both sides enough to potentially be dangerous. The sign shouldn't be needed if the narrowing doesn't remove a lane from the junction and the lane does not have a severe taper. Table 4 1 on page 19 of the Traffic Signs Manual, Chapter 4 covers the specific taper criteria. This is also sometimes mistaken as the "No Through Road" or "End of Dual Carriageway" sign. You can