Crossing a dual carriageway or joining it by turning right
As soon as you can do so safely, take up a position just left of the middle of the road.
If the median (the space in the central dividing strip) is too narrow for your vehicle, wait on the minor road until you can clear both sides of the carriageway, and complete your turn in one go.
If the median is wide enough for your vehicle, when it is safe to do so you may proceed and stop and wait in the median space until there is a safe gap in traffic.
Finish your crossing or turn into the second half of the dual carriageway and build up your speed to that of the normal flow of traffic, subject to speed limits and prevailing road conditions.
If another vehicle is already blocking the median space, wait on the minor road until there is enough space to clear the first half of the road without stopping on the carriageway.
When driving a large vehicle, it is generally not safe to treat each half of the dual carriageway as a separate road. You should remain on the minor road until you can cross both sides of the dual carriageway without having to stop.
Always take care when you are behind large vehicles or vehicles towing trailers when they are turning. Remember, a long vehicle or combination needs extra room to finish a turn. Cyclists, e-scooters, e-mopeds, motorcyclists and pedestrians, in particular, should be extra careful when near these vehicles.