How to Drive Through a Roundabout in South Carolina

What a roundabout is and how it works

A roundabout is a circular intersection where traffic flows counterclockwise around a central island. Instead of stopping at a traffic light or stop sign, you enter the circle, move around it, and exit onto the street you want. South Carolina has been adding roundabouts to busy intersections, especially in the Lowcountry and around growing areas like the Midlands.

The basic rule is simple: traffic already in the roundabout has the right of way. You yield to vehicles already circling before you enter. Once you are in, you have the right of way over anyone trying to enter behind you. This is the opposite of a traditional intersection, where you might have the right of way based on a traffic signal.

Roundabouts move traffic faster than traffic lights because vehicles do not have to stop and wait for a signal to change. They also reduce the number and severity of crashes because the circular design forces slower speeds and eliminates high-speed T-bone collisions.

Key Takeaways

• Yield to traffic already in the roundabout before you enter; do not enter if a vehicle is approaching from your left.
• Stay in the right lane for exits near the entrance; use the left lane only if you are going more than halfway around the circle.
• Do not stop in the roundabout unless traffic forces you to; keep moving slowly and steadily.
• Signal your exit by turning on your right turn signal before you leave the roundabout, not when you enter.
• Pedestrians and cyclists have the right of way at the crosswalks before the roundabout entrance.

How to enter a roundabout safely

Approach the roundabout at a slow speed — typically 15 to 20 miles per hour — and look to your left. If a vehicle is in the roundabout or approaching from your left, you must yield and wait. Do not enter until there is a clear gap in traffic. Treat the entrance like a yield sign, not a stop sign; you do not have to come to a complete stop, but you must be ready to do so.

Once you see a safe gap, enter the roundabout and move into the right lane. Keep your speed low and steady. Do not accelerate sharply or try to race through. The slower you go, the more time you have to react if another driver makes a mistake or if pedestrians are crossing.

If you are turning right or going straight, stay in the right lane the entire time. If you are turning left or going more than halfway around the circle, you may use the left lane. Check your mirrors and blind spots before changing lanes inside the roundabout, just as you would on a regular road.

Choosing the correct lane and exiting

Most South Carolina roundabouts have two lanes. The right lane is for drivers exiting soon; the left lane is for drivers going further around. Before you enter, decide roughly where your exit is. If it is the first or second exit, use the right lane. If it is the third or fourth exit (or if you are going almost all the way around), use the left lane.

As you approach your exit, move into the right lane if you are not already there. Turn on your right turn signal before you leave the roundabout — not when you enter. This tells other drivers and pedestrians that you are about to exit. Slow down slightly as you approach your exit, then drive out onto the street you want.

If you miss your exit, do not stop or back up. Simply continue around the roundabout and try again. It is safer to go around twice than to brake suddenly or reverse inside the circle.

What to do if you are confused or stuck

If you are unsure which lane to use or you are not certain where your exit is, stay in the right lane and go slowly. You can circle the roundabout as many times as you need to figure out where you are going. Other drivers expect this and will yield to you as you re-enter.

If you accidentally enter the left lane and realize you need to exit sooner, do not try to cut across. Continue around and exit at the next opportunity, then turn around if needed. Trying to change lanes suddenly inside a roundabout is more dangerous than taking an extra loop.

If traffic is heavy and you cannot find a gap to enter, keep looking. A gap will appear. Do not try to force your way in or assume another driver will let you through. Patience is safer than aggression at a roundabout entrance.

Rules for pedestrians and cyclists at roundabouts

Pedestrians cross at marked crosswalks before the roundabout entrance, not inside the circle. Drivers must yield to pedestrians in these crosswalks, just as they would at any other intersection. If you see a pedestrian stepping into a crosswalk, slow down and let them cross before you enter the roundabout.

Cyclists may ride through the roundabout like a car, staying in the right lane and following the same rules as vehicles. Some roundabouts have a separate bike lane or path around the outside; if one is marked, cyclists should use it. Drivers should watch for cyclists, especially in the right lane where they may be less visible.

Common mistakes to avoid

Do not stop inside the roundabout unless traffic forces you to. Stopping unexpectedly can cause a rear-end crash. If you need to wait for a gap, wait outside the roundabout before entering, not inside it.

Do not use your turn signal when you enter the roundabout. Your signal should only come on when you are ready to exit. Signaling at the entrance confuses other drivers about your intentions.

Do not assume other drivers know the rules. Some drivers may not yield correctly or may use the wrong lane. Drive defensively, stay alert, and be ready to slow down or stop if another vehicle behaves unexpectedly.

Do not try to pass other vehicles inside the roundabout. Stay in your lane and maintain a steady speed. Passing increases the risk of a collision and is not worth the few seconds you might save.

Roundabouts in South Carolina by region

South Carolina has installed roundabouts in several communities, with concentrations in the Charleston area, Beaufort County, and parts of the Midlands. If you are new to an area or unfamiliar with a particular roundabout, slow down and pay close attention to lane markings and exit signs. Many roundabouts have signs showing which lane to use for which exit, similar to highway interchanges.

If you are unsure about a roundabout's layout, you can drive through it slowly and observe how other drivers navigate it. Most roundabouts follow the same basic rules, so once you understand the principle, you can handle any roundabout in the state.

Frequently Asked Questions

Do I have to yield at a roundabout entrance?

Yes. Traffic already in the roundabout has the right of way. You must yield and wait for a safe gap before entering. Treat the entrance like a yield sign.

What if I am in the wrong lane inside the roundabout?

Do not try to change lanes suddenly. Continue around the roundabout and exit at the next opportunity, then turn around if needed. It is safer to go around again than to cut across lanes.

Can I turn right on red at a roundabout?

No. Roundabouts do not have red lights. You must yield to traffic in the roundabout and wait for a safe gap to enter, even if you are only turning right.

Should I signal when I enter a roundabout?

No. Do not signal when entering. Signal only when you are exiting, to let other drivers and pedestrians know you are leaving the roundabout.

What if a pedestrian is crossing at the exit I want to use?

Yield to the pedestrian and wait for them to finish crossing before you exit. Pedestrians have the right of way at crosswalks, even at roundabout exits.