The zipper merge uses both lanes until the last moment before merging. Drivers take turns like the teeth of a zipper. This method improves traffic flow and safety in slow or congested traffic. But is it a legal requirement in South Carolina or just good manners?
Traffic laws in South Carolina
South Carolina law says drivers must stay within a single lane until it is safe to change lanes. A driver must yield right-of-way when moving over. But the law does not require a zipper merge. That tactic is a recommended best practice—not a legal mandate.
No law forces drivers to merge early or to yield space for merging traffic. The continuing lane has the right of way; merging drivers must yield to it. Still, construction zones may include signs, but alerts do not carry the force of law regarding the order of merging.
Zipper merge best practices
The South Carolina driver’s manual encourages zipper merging when traffic slows in work zones. The DMV has added zipper merge guidance to its manual. Studies show this reduces backup length and road rage.
What drivers should do
Knowing how to merge correctly can make traffic safer and less stressful for everyone. Here are some tips to help you merge properly and keep things moving.
- Stay in your lane. When a lane ends ahead, remain in your lane if traffic goes.
- Take turns merging at the merge point.
- Merge smoothly at safe intervals.
- Do not cut off other drivers.
- If traffic moves freely, merge earlier to avoid abrupt lane changes.
These steps can keep traffic flowing. It can also help reduce the risk of road rage or accidents.
Implications for non-compliance
Failing to merge safely can cause accidents or violations. You must ensure it is safe before changing lanes. If you cause a crash by weaving or merging, you can be cited for a reckless or improper lane change.
The zipper merge remains voluntary in South Carolina. But it is a smart, courteous and safer approach—especially in construction or slow traffic. Although it is not legally required, using it responsibly can help prevent accidents and legal issues. Learning proper merging can protect your rights and keep traffic moving smoothly.
