From the South Carolina Department of Motor Vehicles (https://www.scdot.org/travel/roundabout-navigation.html):

There are a few key points to remember when driving a roundabout:

• Yield to other drivers within the roundabout. For multilane RBTs, you must yield to BOTH lanes of circulating traffic
• Do not change lanes or pass others.
• Do not stop within the roundabout.
• Avoid driving next to large trucks.
• Use your turn signal before exiting the roundabout.
• SLOW DOWN when approaching a roundabout.
• SELECT the correct lane. For multi-lane roundabouts, stay left if you intend to make a left or u-turn.
• WATCH for pedestrians in the crosswalk.
• WATCH for bicyclists and allow them to merge into the entry lane.
• YIELD to traffic already in the roundabout.
• MERGE into the traffic flow when it is safe.
• DO NOT STOP in the roundabout except to avoid a collision. Continue through the roundabout until you reach your exit.
• DO NOT PASS other vehicles. Maintain a slow speed through the roundabout.
• EXIT the roundabout immediately if an emergency vehicle approaches, and then pull over.
• YIELD to pedestrians and bicyclists when exiting the roundabout.