But there are some big differences. On a dual carriageway, you can expect learner drivers, slow farm vehicles, right hand turns, traffic lights, roundabouts and even cyclists. You won't see any of those on a motorway!
Make sure that you check your mirrors, blind spot and signal to join. Don't cause other drivers to slow down or swerve. If it's busy, check that other drivers have noticed you wanting to join and slowly move onto the dual carriageway from the slip road once it's safe. Other drivers will normally notice you wanting to join and react by giving you space or changing lanes.
Only overtake if the vehicle in front of you is travelling slower than you. Give yourself plenty of time to overtake and make sure that it's safe and that you won't have to drive over the speed limit. Use your MSM routine, making sure to signal to other road users your intention. Move back to the left lane once you have finished overtaking. Don't turn back in too soon and take away the other vehicles stopping distance. Always remember to signal.
Moving back to the left lane when it's safe is important so that you don't cause congestion and annoy other drivers who might want to overtake you.
If there is a slip road, then look out for countdown marker signs that will indicate how far to the start of the slip road (300 yards, 200 yards and 100 yards). Be prepared and don't rush to exit. Slow down once you have turned onto the slip road and look out for a possible change in speed limit (which may feel slower than normal), a roundabout or traffic lights.