Roundabouts

The following information has been copied from the RTA website:

The roundabout sign

The roundabout sign means Slow Down, prepare to Give Way and if necessary stop to avoid a collision.

So, as you're approaching a roundabout, you must get into the correct lane, indicate if turning, and give way to traffic already on the roundabout.

Enter the roundabout when there is a safe gap in the traffic.

Giving way

Slow down as you approach a roundabout. You must give way to traffic already on the roundabout if there is a risk of collision. Enter the roundabout when there is a safe gap in the traffic.

Indicating

When approaching a roundabout, if you are turning left or right, you must indicate left or right.

When exiting a roundabout, whether you are turning left, right or even going straight ahead, you must always indicate a left turn just before you exit, unless it is not practical to do so.

Single lane roundabouts

The rules for slowing down, giving way and indicating when approaching and exiting at roundabouts are the same for single lane and multi-lane roundabouts.

Cyclists and roundabouts

At roundabouts with two or more marked lanes or lines of traffic, a cyclist has the option of turning right by entering the roundabout from either left or right lanes. However, if the cyclist chooses to enter from the left lane, the cyclist must take care to give way to any vehicle leaving the roundabout.

Going left

Slow down and prepare to give way as you approach the roundabout.
On approach you must be in the left lane unless otherwise marked on the road, and indicate a left turn.
You must give way to traffic already on the roundabout if there is any risk of a collision.
Enter the roundabout when there is a safe gap in the traffic.
Stay in the left lane.
Keep your left indicator on until you have exited the roundabout.

Going right

Slow down and prepare to give way as you approach the roundabout.
On approach you must be in the right lane unless otherwise marked on the road, and indicate a right turn.
You must give way to traffic already on the roundabout if there is any risk of a collision.
Enter the roundabout when there is a safe gap in the traffic.
Stay in the right lane.
You must indicate a left turn just before your exit unless it is not practical to do so.

Going straight ahead

Slow down and prepare to give way as you approach the roundabout.
On approach you can be in either lane, unless otherwise marked on road.
When going straight ahead you do not need to indicate on approach.
You must give way to traffic already on the roundabout if there is any risk of collision.
Enter the roundabout when there is a safe gap in the traffic.
You must indicate a left turn just before you exit unless it is not practical to do so.