Explanation

"When turning right from a side road across a dual carriageway, make sure that the central reservation is wide enough to contain your vehicle. If it isn't, you'll have to treat the dual carriageway as one road and only emerge when it's clear in both directions. Drivers of longer vehicles and vehicles towing trailers or caravans will need to assess this carefully. If any part of an emerging vehicle obstructs the right-hand lane of the dual carriageway, it could have serious consequences."